floresta is on the money with the hex values representing the bit patterns.
to make things easier for me to compare with the data sheet I used the B macros to expose the bits.
I defined the instructions like this code below. Very easy to match with datasheet instruction tables.
My display is in 8 bit mode so each bit is a different pin of the set DB0-DB7 ( right to left )
#define ST7920_CMD_CLEAR B00000001 // 0x01 - Clear Display
#define ST7920_CMD_HOME B00000010 // 0x02 - Move Cursor Home
#define ST7920_CMD_EM B00000100 // 0x04 - Entry Mode Base
#define ST7920_CMD_EM_INCRR B00000010 // 0x02 - Increment Cursor Right
#define ST7920_CMD_EM_INCRL B00000000 // 0x00 - Increment Cursor Left
#define ST7920_CMD_EM_SHFTR B00000011 // 0x03 - Shift Display Right
#define ST7920_CMD_EM_SHFTL B00000001 // 0x01 - Shift Display Left
And the 0x1 is a number in base 16 rather than decimal ( base 10 )
0x specifies a hexadecimal number