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RM0041 ----> 6.2.10 Clock-out capability
The microcontroller clock output (MCO) capability allows the clock to be output onto the
external MCO pin. The configuration registers of the corresponding GPIO port must be
programmed in alternate function mode. One of 4 clock signals can be selected as the MCO
clock.
● SYSCLK
● HSI
● HSE
● PLL clock divided by 2
The selection is controlled by the MCO[2:0] bits of the Clock configuration register
(RCC_CFGR).

RM0041 ----> 6.3.2 Clock configuration register (RCC_CFGR)
Bits 26:24 MCO: Microcontroller clock output
Set and cleared by software.
0xx: No clock
100: System clock (SYSCLK) selected
101: HSI clock selected
110: HSE clock selected
111: PLL clock divided by 2 selected
Note: This clock output may have some truncated cycles at startup or during MCO clock
source switching.
+ Нашел еще в RM0008 дополнение
When the System Clock is selected to output to the MCO pin, make sure that this clock
does not exceed 50 MHz (the maximum IO speed).

RM0041 ----> 7.1 GPIO functional description
По 2м таблицам установил альтернативную ф-ю.
Table 16. Port bit configuration table
Table 17. Output MODE bits

RM0041 ----> 7.1.11 GPIO configurations for device peripherals
Table 27. Other IOs
Pins ....... Alternate function ............ GPIO configuration
MCO____ Clock output ____________ Alternate function push-pull

#include "stm32f10x.h"
//#include "stm32f10x_rcc.h"
//#include "stm32f10x_gpio.h"

int main(void)
{
//GPIO_InitTypeDef GPIO_InitStructure; // когда используются библиотеки gpio.c от ST

// Подадим такттирование на PORTА
// RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE);
/*-- или так -- */
RCC->APB2ENR |= RCC_APB2ENR_IOPAEN;

// Выход РА8, в альтернативную ф-ю МСО (CNF1= 1, CNF0= 0; MODE1= 1; MODE0= 1)
/* GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init( GPIOA, &GPIO_InitStructure); */
/*-- или так -- */
GPIOA->CRH = (GPIO_CRH_MODE8 | GPIO_CRH_CNF8_1); // GPIO_Speed_50MHz; GPIO_Mode_AF_PP;
/* GPIO_CRH_MODE8 => 50 MHz
GPIO_CRH_MODE8_0 => 10 MHz
GPIO_CRH_MODE8_1 => 2 MHz */

// Укажем какую тактовую подадим на выход

// RCC_MCOConfig (RCC_MCO_NoClock);
// RCC_MCOConfig (RCC_MCO_SYSCLK);
// RCC_MCOConfig (RCC_MCO_HSI);
// RCC_MCOConfig (RCC_MCO_HSE);
// RCC_MCOConfig (RCC_MCO_PLLCLK_Div2);

/*-- или так -- */
// RCC->CFGR |= RCC_CFGR_MCO_2; // RCC_MCO_SYSCLK
// RCC->CFGR |= RCC_CFGR_MCO_NOCLOCK;
RCC->CFGR |= RCC_CFGR_MCO_SYSCLK;
// RCC->CFGR |= RCC_CFGR_MCO_HSI;
// RCC->CFGR |= RCC_CFGR_MCO_HSE;
// RCC->CFGR |= RCC_CFGR_MCO_PLL;

while (1)
{

}


}

//**************************** Инициализация KS0066 ****************************
void init_LCD_KS0066(void)
{

#define LCD_port GPIOB->BSRR

#define RS_0 GPIO_BSRR_BR6
#define EN_0 GPIO_BSRR_BR7
#define RS_1 GPIO_BSRR_BS6
#define EN_1 GPIO_BSRR_BS7

#define D0_0 GPIO_BSRR_BR8
#define D1_0 GPIO_BSRR_BR9
#define D2_0 GPIO_BSRR_BR10
#define D3_0 GPIO_BSRR_BR11
#define D4_0 GPIO_BSRR_BR12
#define D5_0 GPIO_BSRR_BR13
#define D6_0 GPIO_BSRR_BR14
#define D7_0 GPIO_BSRR_BR15

#define D0_1 GPIO_BSRR_BS8
#define D1_1 GPIO_BSRR_BS9
#define D2_1 GPIO_BSRR_BS10
#define D3_1 GPIO_BSRR_BS11
#define D4_1 GPIO_BSRR_BS12
#define D5_1 GPIO_BSRR_BS13
#define D6_1 GPIO_BSRR_BS14
#define D7_1 GPIO_BSRR_BS15

#define funct_SET (D7_0 | D6_0 | D5_1 | D4_1 | D3_1 | D2_1 | D1_0 | D0_0)
#define lcd_ON_OFF (D7_0 | D6_0 | D5_0 | D4_0 | D3_1 | D2_1 | D1_1 | D0_0) // display ON; cursor ON; blink OFF
#define disp_CLEAR (D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_1)
#define mode_SET (D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_1 | D1_1 | D0_1) // increment; shift ON;

#define wait(mk_s) ((mk_s-1.7503)/1.333);

LCD_port = RS_0 | EN_0 | D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;


tmp=wait(70000); while (tmp) tmp--; // wait 30 ms

// Function SET
tmp=wait(35000); while (tmp) tmp--; // wait 30 ms
LCD_port = RS_0 | EN_1;
LCD_port = funct_SET;
LCD_port = EN_0;
LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;

// Display ON/OFF Control ---> display ON; cursor ON; blink OFF
tmp=wait(100); while (tmp) tmp--; // wait 39 mks
LCD_port = RS_0 | EN_1;
LCD_port = lcd_ON_OFF;
LCD_port = EN_0;
LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;

// Display Clear
tmp=wait(100); while (tmp) tmp--; // wait 39 mks
LCD_port = RS_0 | EN_1;
LCD_port = disp_CLEAR;
LCD_port = EN_0;
LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;

// Entry Mode Set ---> increment; shift ON;
tmp=wait(2000); while (tmp) tmp--; // wait 1.53 ms
LCD_port = RS_0 | EN_1;
LCD_port = mode_SET;
LCD_port = EN_0;
LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;

// LCD_port = RS_0 | EN_1 | D7_1 | D6_1 | D5_1 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;

/* // Return Home
tmp=wait(2000); while (tmp) tmp--; // wait 39 mks
LCD_port = RS_0 | EN_1;
LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_1 | D0_0;
LCD_port = EN_0;
LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;*/

// Display ON/OFF Control ---> display ON; cursor OFF; blink ON
tmp=wait(1000); while (tmp) tmp--; // wait 39 mks
LCD_port = RS_0 | EN_1;
LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_1 | D2_1 | D1_0 | D0_1;
LCD_port = EN_0;
LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;

// Отобразим Ф = АА
tmp=wait(4000); while (tmp) tmp--; // wait 39 mks
LCD_port = RS_1 | EN_1;
LCD_port |= D7_1 | D6_0 | D5_1 | D4_0 | D3_1 | D2_0 | D1_1 | D0_0;
LCD_port = EN_0;
//LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;

// Отобразим 3 = 33
tmp=wait(4000); while (tmp) tmp--; // wait 39 mks
LCD_port = EN_1;
LCD_port = D7_0 | D6_0 | D5_1 | D4_1 | D3_0 | D2_0 | D1_1 | D0_1;
LCD_port = EN_0;
//LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;

// Отобразим U = 55
tmp=wait(4000); while (tmp) tmp--; // wait 39 mks
LCD_port = EN_1;
LCD_port = D7_0 | D6_1 | D5_0 | D4_1 | D3_0 | D2_1 | D1_0 | D0_1;
LCD_port = EN_0;
//LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;

// Отобразим в степени 15 = 7D;
tmp=wait(4000); while (tmp) tmp--; // wait 39 mks
LCD_port = EN_1;
LCD_port = D7_0 | D6_1 | D5_1 | D4_1 | D3_1 | D2_1 | D1_0 | D0_1;
LCD_port = EN_0;
LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;

// Set DDRAM Address // Отобразим 2ю строку D7=1, D6..0 = 1000000 (40h);
// In case of 2-line display, the address range of DDRAM is 00H-27H and 40H-67H.
tmp=wait(4000); while (tmp) tmp--; // wait 39 mks
LCD_port = RS_0 | EN_1 | D7_1;
LCD_port = D6_1 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;
LCD_port = EN_0;
LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;

// Отобразим стрелку вверх = D9, $ = 24, вниз = DA
tmp=wait(4000); while (tmp) tmp--; // wait 39 mks
LCD_port = RS_1 | EN_1;
LCD_port |= D7_1 | D6_1 | D5_0 | D4_1 | D3_1 | D2_0 | D1_0 | D0_1; // вверх = D9
LCD_port = EN_0;
tmp=wait(4000); while (tmp) tmp--; // wait 39 mks
LCD_port = EN_1;
LCD_port = D7_0 | D6_0 | D5_1 | D4_0 | D3_0 | D2_1 | D1_0 | D0_0; // $ = 24
LCD_port = EN_0;
tmp=wait(4000); while (tmp) tmp--; // wait 39 mks
LCD_port = RS_1 | EN_1;
LCD_port |= D7_1 | D6_1 | D5_0 | D4_1 | D3_1 | D2_0 | D1_1 | D0_0; // вниз = DA
LCD_port = EN_0;
//LCD_port = D7_0 | D6_0 | D5_0 | D4_0 | D3_0 | D2_0 | D1_0 | D0_0;
}

LCD_CLEAR();

lcd_write_cmd (0x40); // установил счетчик в CGRAM по адресу 0х00, команда 100_0000 = 0х40

// заливаю черепок в нулевую ячейку памяти
lcd_write_data (0x1F);
lcd_write_data (0x15);
lcd_write_data (0x15);
lcd_write_data (0x1F);
lcd_write_data (0x0A);
lcd_write_data (0x1F);
lcd_write_data (0x15);
lcd_write_data (0x1F);

// заливаю смайл в первую ячейку памяти
lcd_write_data (0x00);
lcd_write_data (0x1B);
lcd_write_data (0x00);
lcd_write_data (0x04);
lcd_write_data (0x00);
lcd_write_data (0x1F);
lcd_write_data (0x11);
lcd_write_data (0x0E);

lcd_write_cmd (0x80); // установил обратно в DDRAM

lcd_write_data (0x00); // пытаюсь вывести черепок
lcd_write_data (0x01); // пытаюсь вывести смайлик
lcd_write_data (0x02); // мусор !!!!

LCD_CLEAR();

lcd_write_cmd (0x41); // установил счетчик в CGRAM по адресу 0х01, команда 100_0000 = 0х41

// заливаю черепок в нулевую ячейку памяти
lcd_write_data (0x1F);
lcd_write_data (0x15);
lcd_write_data (0x15);
lcd_write_data (0x1F);
lcd_write_data (0x0A);
lcd_write_data (0x1F);
lcd_write_data (0x15);
lcd_write_data (0x1F);

//lcd_write_cmd (0x80); // установил обратно в DDRAM

//lcd_write_cmd (0x42); // установил счетчик в CGRAM по адресу 0х02, команда 100_0001 = 0х42

// заливаю смайл в первую ячейку памяти
lcd_write_data (0x00);
lcd_write_data (0x1B);
lcd_write_data (0x00);
lcd_write_data (0x04);
lcd_write_data (0x00);
lcd_write_data (0x1F);
lcd_write_data (0x11);
lcd_write_data (0x0E);

lcd_write_cmd (0x80); // установил обратно в DDRAM

lcd_write_data (0x00); // мусор !!!!
lcd_write_data (0x01); // пытаюсь вывести черепок
lcd_write_data (0x02); // пытаюсь вывести смайлик