P80C557E4 查看數據表（PDF） - Philips Electronics

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P80C557E4

Single-chip 8-bit microcontroller

Philips Electronics 

Philips Semiconductors

Single-chip 8-bit microcontroller

Product specification

P83C557E4/P80C557E4/P89C557E4

TM2CON (EAH)

7

T2IS1

6

T2IS0

5

T2ER

4

T2BO

3

T2P1

Figure 22. T2 control register (TM2CON).

2

T2P0

1

T2MS1

0

T2MS0

Table 15. Description of TM2CON bits

SYMBOL

BIT

FUNCTION

T2IS1

TM2CON.7 Timer T2 16-bit overflow interrupt select

T2IS0

TM2CON.6 Timer T2 byte overflow interrupt select

T2ER

TM2CON.5 Timer T2 external reset enable. When this bit is set, Timer T2 may be reset by a rising edge on RT2 (P1.5).

T2BO

TM2CON.4 Timer T2 byte overflow interrupt flag

T2P1

TM2CON.3 Timer T2 prescaler select

T2P0

TM2CON.2

T2MS1

TM2CON.1 Timer T2 mode select

T2MS0

TM2CON.0

Table 16. Timer 2 prescaler select

T2P1

T2P0

0

0

Clock source

0

1

Clock source/2

1

0

Clock source/4

1

1

Clock source/8

TIMER T2 CLOCK

Table 17. Timer 2 mode select

T2MS1

T2MS0

0

0

Timer T2 halted (off)

0

1

T2 clock source = fCLK/12

1

0

Test mode; do not use

1

1

T2 clock source = pin T2

MODE SELECTED

1999 Mar 02

25

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