HD6433636SW datasheet(173/418 Pages) RENESAS

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159

Port Control Register E (PCRE)

Bit

76543210

————

PCRE

——

Initial value

11110000

Read/Write

————W

—

PCRE is a 2-bit register for controlling whether each of the port E pins PE

3 and PE2 functions as

an input pin or output pin. Setting a PCRE bit to 1 makes the corresponding pin an output pin,

while clearing the bit to 0 makes the pin an input pin.

Upon reset, PCRE is initialized to H'F0.

PCRE is a write-only register. All bits are read as 1.

8.11.3

Pin Functions

Table 8.28 shows the port E pin functions.

Table 8.28

Port E Pin Functions

Pin Functions and Selection Method

3, PE2

The pin function depends on bit PCRE

n in PCRE.

(n = 3, 2)

PCRE

Pin function

n input pin

n output pin

8.11.4

Pin States

Table 8.29 shows the port E pin states in each operating mode.

Table 8.29

Port E Pin States

Pins

Reset

Sleep

Subsleep Standby

Watch

Subactive Active

3, PE2

High-

impedance

Retains

state

Retains

state

High-

impedance

Retains

state

Functional

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