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INPUT/OUTPUT PORTS AND PIN FUNCTIONS

8-31

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

8.3 Input/Output Port Related Registers

(3) PIEN0 (Port input enable) bit (Bit 15)

This bit is used to prevent shoot-through current from flowing into the port input pins.

Because the input/output ports are disabled against input upon exiting reset, if any ports need to be used in

input mode they must be enabled for input by setting this bit to "1."

When disabled against input, the input/output ports are in a state equivalent to a situation where the pin has

"L" level input applied. Consequently, if a peripheral input function (uncontrolled pin) is selected for any port

while disabled against input by using the Port Operation Mode Register, the port may operate unexpectedly

due to the "L" level input on it.

The following shows the procedure for selecting a peripheral input function.

(1) Enable the port for input when its pin level is valid ("H" or "L")

(2) Select a function using the port operation mode bit

During boot mode, the pins shared with serial interface functions are enabled for input and can therefore be

protected against shoot-through current flowing in from the pins other than serial interface functions during

flash programming by clearing PIEN0.

The table below lists the pins that can be controlled by the PIEN0 bit in each operation mode.

Table 8.3.2 Pins Controllable by Port Input Enable Bit

Mode Name

Controllable Pins

Uncontrolled Pins

P00–P07, P10–P17, P20–P27

P221, FP, SBI#, MOD0, MOD1, MOD2, RESET#

P30–P37, P41–P47, P61–P63

Single-chip

P70–P77, P82–P87, P93–P97

P100–P107, P110–P117, P124–P127

P130–P137, P150, P153, P174, P175

P220, P224, P225

P61–P63, P70–P77, P82–P87

P00–P07, P10–P17

External extension

P93–P97, P100–P107, P110–P117

P20–P27, P30–P37

Microprocessor

P126, P127, P130–P137

P41–P47, P124, P125, P221, P224, P225

P150, P153, P174, P175, P220

FP, SBI#, MOD0, MOD1, MOD2, RESET#

P00–P07, P10–P17, P20–P27

P82–P87, P174, P175, P221

Boot

P30–P37, P41–P47, P61–P63

FP, SBI#, MOD0, MOD1, MOD2, RESET#

(single-chip)

P70–P77, P93–P97, P100–P107

P110–P117, P124–P127, P130–P137

P150, P153, P220, P224, P225

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