KSI-W002-000

10

6.9

I /O Ports

Port C/REM

Port C/REM is a 1-bit output port, which is related with the bit 3 of accumulator, with CMOS

N-channel open drain, which have large current sink capability, for I.R.LED drive.

This output can be configured as carrier frequency by programming the register Z and port

C data. This pin is put into the high-impedance state in stop mode.

Port D

Port D is a 4-bit input port with pull-up resistor. Forcing any input pins to “L” state, system

reset occurs and it starts to operate from the reset address.

Port E

Port E is a 4-bit input port with pull-up resistor. Forcing any input pins to

reset occurs and it starts to operate from the reset address.

Port F

Port F is an 8-bit output port with N-channel open drain. Each output which specified by the

lower 3-bit of register L can be set and reset individually. All F pins are put into the low

state in stop mode.

Port G

Port G is a 1-bit output port with N-channel open drain. When stop mode is specified, this

pin still remains in the previous state. Set this pin to appropriate state before entering

stop mode for visible LED or key scan application.

Port K

Port K is a 1-bit output port with N-channel open drain. When stop mode is specified, this

pin still remains in the previous state. Set this pin to appropriate state before entering stop

mode for visible LED or key scan application.

SD6830