CS5535 datasheet(329/555 Pages) NSC

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PIT Register Descriptions (Continued)

5.8.2.7

PIT Mode Control Word (PIT_MODECTL_WORD)

I/O Address

43h

Type

R/W

Reset Value

00h

PIT_MODECTL_WORD Register Map

CNTR_SEL

R/W_MODE

CNTR_MODE

BCD

PIT_MODECTL_WORD Bit Descriptions

Bit

Name

Description

7:6

CNTR_SEL

Counter Select.

00: Counter 0.

01: Counter 1.

10: Counter 2.

11: Read-back Command (Note 1).

Note 1. If bits [7:6] = 11: Register functions as Read Status Command

Bit 5 = Latch Count, Bit 4 = Latch Status, Bit 3 = Select Counter 2, Bit 2 = Select Counter 1, Bit 1 = Select Counter

0, and Bit 0 = Reserved.

5:4

RW_MODE

Current Read/Write Mode.

00: Counter latch command (Note 2).

01: R/W LSB only.

10: R/W MSB only.

11: R/W LSB, followed by MSB.

Note 2. If bits [5:4] = 00: Register functions as Counter Latch Command

Bits [7:6] = Selects Counter, and [3:0] = Don’t care.

3:1

CNTR_MODE

Current Counter Mode.

000: Interrupt on terminal count.

001: Programmable one-shot.

010, 110: Rate generator.

011, 111: Square wave generator.

100: Software triggered pulse generator.

101: Hardware triggered pulse generator.

0BCD

BCD Mode.

0: Binary.

1: BCD (binary coded decimal).

CS5535 数据表(PDF) 329 Page - National Semiconductor (TI)

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