SH7708 datasheet(445/633 Pages) RENESAS

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15.1.4

Table 15.3 shows the configuration of the two registers of the 8-bit general-purpose I/O port

(PCTR and PDTR) and the one register of the SCI I/O port (SCSPTR).

Table 15.3

Symbol

R/W

Initial Value*

Address

Access Size

Port control register

PCTR

R/W

H'0000

H'FFFFFF76

Port data register

PDTR

R/W

Undefined

H'FFFFFF78

Serial port register

SCSPTR

R/W

H'FFFFFF7C

Notes: 1. Initialized by a power-on reset.

2. Bits other than 2 and 0 are initialized to H'00. Bits 2 and 0 are undefined.

15.2

15.2.1

Port Control Register (PCTR)

Bit:

Bit name:

PB7

PUP

PB7

PB6

PUP

PB6

PB5

PUP

PB5

PB4

PUP

PB4

Initial value:

R/W:

R/W

Bit:

Bit name:

PB3

PUP

PB3

PB2

PUP

PB2

PB1

PUP

PB1

PB0

PUP

PB0

Initial value:

R/W:

R/W

The port control register (PCTR) is a 16-bit read/write register that controls the input/output

direction and pull-up for each bit in the 8-bit port. As the initial value of the port data register

(PDR) is undefined, all the bits in the 8-bit port should be set to output with PCTR after writing a

value to the PDTR register.

PCTR is initialized to H'0000 by a power-on reset. It is not initialized by a manual reset or in

standby mode, and retains its contents.

SH7708 Datasheet(PDF) 445 Page - Renesas Technology Corp

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