P87LPC779 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

P87LPC779

CMOS single-chip 8-bit 80C51 microcontroller with 128-byte data RAM, 8 kB OTP

Philips Electronics 

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Table 3: Special function registers…continued

* indicates SFRs that are bit addressable.

Name Description

SFR Bit functions and addresses

addr.

Reset

value

MSB

LSB Hex

SP

Stack pointer

81h

07h

Bit address 8F

8E

8D

8C

8B

8A

89

88

TCON* Timer0 and 1 control

88h

TF1

TR1

TF0

TR0

IE1

IT1

IE0

IT0 00H

TH0

Timer0 HIGH

8Ch

00H

TH1

Timer1 HIGH

8Dh

00H

TL0

Timer0 LOW

8Ah

00H

TL1

Timer1 LOW

8Bh

00H

TMOD Timer0 and 1 mode

89h

GATE

C/T

M1

M0

GATE

C/T

M1

M0 00H

WDCON Watchdog control register

A7h

-

-

WDOVF WDRUN WDCLK WDS2

WDS1

WDS0 [3]

WDRST Watchdog reset register

A6h

xxh

[1] I/O port values at reset are determined by the PRHI bit in the UCFG1 configuration byte.

[2] The PCON reset value is xxBOF POF - 0000b. The BOF and POF flags are not affected by reset. The POF flag is set by hardware upon power up. The BOF flag is set by the

occurrence of a brownout reset/interrupt and upon power up.

[3] The WDCON reset value is xx11 0000b for a Watchdog reset, xx01 0000b for all other reset causes if the Watchdog is enabled, and xx00 0000b for all other reset causes if the

Watchdog is disabled.

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