User`s manual

24
User system
interface cable
PA1 to PA3
MCU
VHCT125
VHC125
Vcc
47 kΩ
CBTS3306
SUB MCU
PD0 to PD7
PA1 to PA3
PD0 to PD7
PA1 to PA3
PD0 to PD7
Figure 3.2 User System Interface Circuits (5)