H8SLASH3021 datasheet(200/712 Pages) RENESAS

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7. I/O Ports

Rev.2.00 Mar. 22, 2007 Page 176 of 684

REJ09B0352-0200

7.11

Port B

7.11.1

Overview

Port B is an 7-bit input/output port that is also used for TPC output (TP

15, TP13 to TP8), ITU

input/output (TIOCB

4, TIOCB3, TIOCA4, TIOCA3) and ITU output (TOCXB4, TOCXA4), and

ADTRG input to the A/D converter. Port B has the same set of pin functions in all operating

modes. Figure 7.23 shows the pin configuration of port B.

Pins in port B can drive one TTL load and a 30-pF capacitive load. They can also drive an LED or

a Darlington transistor pair. Pins PB

3 to PB0 have Schmitt-trigger inputs.

Port B

PB (input/output)/TP

(output)/

ADTRG (input)

PB (input/output)/TP

(output)/TOCXB (output)

PB (input/output)/TP

(output)/TOCXA (output)

Port B pins

PB (input/output)/TP

(output)/TIOCB (input/output)

PB (input/output)/TP

(output)/TIOCA (input/output)

PB (input/output)/TP

(output)/TIOCB (input/output)

PB (input/output)/TP

(output)/TIOCA (input/output)

Figure 7.23 Port B Pin Configuration

7.11.2

Table 7.17 summarizes the registers of port B.

Table 7.17

Port B Registers

Address*

Name

Abbreviation

R/W

Initial Value

H'FFD4

Port B data direction register

PBDDR

H'00

H'FFD6

Port B data register

PBDR

R/W

H'00

Note:

Lower 16 bits of the address.

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