P80C557E6EFB 查看數據表（PDF） - Philips Electronics

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P80C557E6EFB

Single-chip 8-bit microcontroller

Philips Electronics 

Philips Semiconductors

Single-chip 8-bit microcontroller

Product specification

P83C557E6/P80C557E6

RTE (EFH)

7

TP47

6

TP46

5

RP45

4

RP44

3

RP43

2

RP42

Figure 26. Reset/Toggle enable register (RTE).

Table 21. Description of RTE bits

SYMBOL

BIT

FUNCTION

TP47

RTE.7

If “1” then P4.7 toggles on a match between CM2 and Timer T2

TP46

RTE.6

If “1” then P4.6 toggles on a match between CM2 and Timer T2

RP45

RTE.5

If “1” then P4.5 toggles on a match between CM1 and Timer T2

RP44

RTE.4

If “1” then P4.4 toggles on a match between CM1 and Timer T2

RP43

RTE.3

If “1” then P4.3 toggles on a match between CM1 and Timer T2

RP42

RTE.2

If “1” then P4.2 toggles on a match between CM1 and Timer T2

RP41

RTE.1

If “1” then P4.1 toggles on a match between CM1 and Timer T2

RP40

RTE.0

If “1” then P4.0 toggles on a match between CM1 and Timer T2

1

RP41

0

RP40

For more information concerning the TM2CON, CTCON, TM2IR and

the STE/RTE registers see IC20 handbook, chapter “80C51 family

hardware description”.

Port 4 can be read and written by software without affecting the

toggle, set and reset signals. At a byte overflow of the least

significant byte, or at a 16-bit overflow of the timer/counter, an

interrupt sharing the same interrupt vector is requested. Either one

or both of these overflows can be programmed to request an

interrupt.

All interrupt flags must be reset by software.

Internal Bus

fCLK/12

Prescaler

(11-bit)

Clear

Timer T3

(8-bit)

LOAD LOADEN

to reset circuitry (see Figure 46)

Write T3

EW

1999 Mar 02

Clear

WLE

PCON.4

Internal Bus

Figure 27. Watchdog timer.

PD

LOADEN

PCON.1

27

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