AAEON TKS-G21-CV05 - Manual (Page 61)

E m b e d d e d B o x T K S - G 2 1 - C V 0 5
Appendix C Digital I/O C-6
call Delay5ms
mov dx, 0f000h + 04h ; Transmit Slave Address
Register
inc ch ; Set the slave address and
mov al, ch ; prepare for a READ command
out dx, al
mov dx, 0f000h + 03h ; Host Command Register
mov al, cl ; offset to read
out dx, al
mov dx, 0f000h + 05h
xor al, al ; Clear old data
out dx, al
mov dx, 0f000h + 02h ; Host Control Reegister
mov al, 48h ; Start a byte access
out dx, al
call CT_Chk_SMBus_Ready
mov dx, 0f000h + 05h
in al, dx
ret