SN8P2200 Series
USB 1.1 Low-Speed 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 109
Version 1.7
10.4
PS2_2 DESCRIPITON
PS2_2 interface is using P1.0, P1.1 open-drain mode to do PS/2 interface. The PS/2 pull-up resistors are external 5K
ohm by hardware design. Set P1.0, P1.1 to be open-drain structure by P1OC register and PS/2 communication is
controlled by firmware.
z
External hardware must include external 5K ohm pull-up resistors.
z
P1.0, P1.1 must be set as open-drain mode.
z
Use firmware to make PS/2 communication routine.
P10OC=1
P10M
Output
Latch
P11OC=1
P11M
Output
Latch
P1.0
P1.1
P1.0
P1.1
HOST
Terminal
VDD (5V)
VDD (5V)
5K
ohm
5K
ohm