SH7052 datasheet(654/919 Pages) RENESAS

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18.3.11

Port E Control Register (PECR)

Bit:

PE15

PE14

PE13

PE12

PE11

PE10

PE9

PE8

Initial value:

R/W:

R/W

Bit:

PE7

PE6

PE5

PE4

PE3

PE2

PE1

PE0

Initial value:

R/W:

R/W

The port E control register (PECR) is a 16-bit readable/writable register that selects the functions

of the 16 multiplex pins in port E. PECR settings are not valid in all operating modes.

1. Expanded mode with on-chip ROM disabled

Port E pins function as address output pins, and PECR settings are invalid.

2. Expanded mode with on-chip ROM enabled

Port E pins are multiplexed as address output pins and general input/output pins. PECR

settings are valid.

3. Single-chip mode

Port E pins function as general input/output pins, and PECR settings are invalid.

PECR is initialized to H'0000 by a power-on reset (excluding a WDT power-on reset), and in

hardware standby mode. It is not initialized in software standby mode or sleep mode.

• Bit 15—PE15 Mode Bit (PE15MD): Selects the function of pin PE15/A15.

Description

Bit 15:

PE15MD

Expanded Mode

with ROM Disabled

Expanded Mode

with ROM Enabled

Single-Chip Mode

Address output (A15)

(Initial value)

General input/output (PE15)

(Initial value)

General input/output (PE15)

(Initial value)

Address output (A15)

General input/output (PE15)

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