SH7101 datasheet(475/560 Pages) RENESAS

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Section 15 I/O Ports

Rev.1.00 Sep. 18, 2008 Page 441 of 522

REJ09B0069-0100

15.5.1

Port F is an 8-bit input-only port in the SH7108 and a 16-bit input-only port in the SH7109. Port F

has the following register. For details on register addresses and register states during each

processing, refer to section 19, List of Registers.

• Port F data register (PFDR)

15.5.2

Port F Data Register (PFDR)

PFDR is a 16-bit read-only register that stores port F data.

In the SH7108, bits PF15DR to PF8DR correspond to pins PF15 to PF8 (multiplexed functions

omitted here). In the SH7109, bits PF15DR to PF0DR correspond to pins PF15 to PF0

(multiplexed functions omitted here).

Any value written into these bits is ignored, and there is no effect on the state of the pins. When

any of the bits are read, the pin state rather than the bit value is read directly. However, when an

A/D converter analog input is being sampled, values of 1 are read. Table 15.5 summarizes port F

data register read/write operations.

Bit

Bit Name

Initial Value

R/W

Description

PF15DR

0/1*

See table 15.5.

PF14DR

0/1*

PF13DR

0/1*

PF12DR

0/1*

PF11DR

0/1*

PF10DR

0/1*

PF9DR

0/1*

PF8DR

0/1*

PF7DR

0/1*

See table 15.5.*

PF6DR

0/1*

PF5DR

0/1*

PF4DR

0/1*

PF3DR

0/1*

PF2DR

0/1*

PF1DR

0/1*

PF0DR

0/1*

Notes: 1. Initial values are dependent on the state of the external pins.

2. These bits are reserved in the SH7108. The write value should always be 0.

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