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5 port 1 input pull-up mos, 2 port 2, 1 port 2 data direction register (p2ddr) – Renesas H8S/2111B User Manual

Page 136

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Rev. 1.00, 05/04, page 102 of 544

7.1.5

Port 1 Input Pull-Up MOS

Port 1 has an on-chip input pull-up MOS function that can be controlled by software. This input
pull-up MOS function can be specified as on or off on a bit-by-bit basis.

Table 7.2 summarizes the input pull-up MOS states.

Table 7.2

Input Pull-Up MOS States (Port 1)

Reset

Hardware Standby Mode

Software Standby Mode In Other Operations

Off Off

On/Off

On/Off

[Legend]
Off:

Input pull-up MOS is always off.

On/Off: On when the pin is in the input state, P1DDR = 0, and P1PCR = 1: otherwise off.

7.2 Port

2

Port 2 is an 8-bit I/O port. Port 2 has an on-chip input pull-up MOS function that can be controlled
by software. Port 2 has the following registers.

• Port 2 data direction register (P2DDR)
• Port 2 data register (P2DR)
• Port 2 pull-up MOS control register (P2PCR)

7.2.1

Port 2 Data Direction Register (P2DDR)

P2DDR specifies input or output for the pins of port 2 on a bit-by-bit basis.

Bit Bit

Name

Initial
Value R/W Description

7 P27DDR

0 W

6 P26DDR

0 W

5 P25DDR

0 W

4 P24DDR

0 W

3 P23DDR

0 W

2 P22DDR

0 W

1 P21DDR

0 W

0 P20DDR

0 W

The corresponding port 2 pins are output ports when
P2DDR bits are set to 1, and input ports when P2DDR
bits are cleared to 0.

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