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[1]

All ports are in input only (high-impedance) state after power-up.

[2]

BRGR1 and BRGR0 must only be written if BRGEN in BRGCON SFR is logic 0. If any are written while BRGEN = 1, the result is unpredictable.

[3]

The RSTSRC register reflects the cause of the P89LPC9402 reset except BOIF bit. Upon a power-up reset, all reset source flags are cleared except POF and BOF; the power-on

reset value is x011 0000.

[4]

After reset, the value is 1110 01x1, i.e., PRE2 to PRE0 are all logic 1, WDRUN = 1 and WDCLK = 1. WDTOF bit is logic 1 after watchdog reset and is logic 0 after power-on reset.

Other resets will not affect WDTOF.

[5]

On power-on reset and watchdog reset, the TRIM SFR is initialized with a factory preprogrammed value. Other resets will not cause initialization of the TRIM register.

[6]

The only reset sources that affect these SFRs are power-on reset and watchdog reset.

TAMOD

Timer 0 and 1 auxiliary

mode

8FH

-

-

-

T1M2

-

-

-

T0M2

00

xxx0 xxx0

Bit address

8F

8E

8D

8C

8B

8A

89

88

TCON*

Timer 0 and 1 control

88H

TF1

TR1

TF0

TR0

IE1

IT1

IE0

IT0

00

0000 0000

TH0

Timer 0 high

8CH

00

0000 0000

TH1

Timer 1 high

8DH

00

0000 0000

TL0

Timer 0 low

8AH

00

0000 0000

TL1

Timer 1 low

8BH

00

0000 0000

TMOD

Timer 0 and 1 mode

89H

T1GATE

T1C/T

T1M1

T1M0

T0GATE

T0C/T

T0M1

T0M0

00

0000 0000

TRIM

Internal oscillator trim

register

96H

RCCLK

ENCLK

TRIM.5

TRIM.4

TRIM.3

TRIM.2

TRIM.1

TRIM.0

[4] [5]

WDCON

Watchdog control register

A7H

PRE2

PRE1

PRE0

-

-

WDRUN

WDTOF

WDCLK

[4] [6]

WDL

Watchdog load

C1H

FF

1111 1111

WFEED1

Watchdog feed 1

C2H

WFEED2

Watchdog feed 2

C3H

Table 4.

* indicates SFRs that are bit addressable.

Name

Description

SFR

addr.

Bit functions and addresses

Reset value

MSB

LSB

Hex

Binary