3822 datasheet(71/328 Pages) RENESAS

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3822 Datasheet(PDF) 71 Page - Renesas Technology Corp

Part #	3822

Description	8-BIT SINGLE-CHIP MICROCOMPUTER

PDF	328 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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71 / 328 page

2.1 I/O pins

APPLICATION

3822 GROUP USER’S MANUAL

2–5

Fig. 2.1.4 Port direction register setting example

(3) Pull-up control and pull-down control

The ports shown in Table 2.1.3 are controlled for pull-up and pull-down by software. Either pull-up or

pull-down is controlled by the PULL register A (address 001616) and the PULL register B (address

001716). Figure 2.1.5 shows the structure of the PULL register A and Figure 2.1.6 shows the structure

of the PULL register B.

Ports

Control

Table 2.1.3 I/O ports which either pull-up or pull-down is controlled by software

Pull-down

Pull-up

P0, P1, P3

P2, P41 to P47, P5 to P7

Example : When setting “6B16”

to the port P2 direction register

P27

P26

P25

P24

P23

P22

P21

P20

Input/output direction of port P2

Output

Input

Output

Input

1 0

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