P87C554 datasheet(18/77 Pages) PHILIPS

18 / 77 page

Philips Semiconductors

Product data

P87C554

80C51 8-bit microcontroller – 12 clock operation

16K/512 OTP/RAM, 8 channel 10-bit A/D, I2C, PWM,

capture/compare, high I/O

2002 Mar 25

ECT0

BIT

SYMBOL

FUNCTION

IEN1.7

ET2

Enable Timer T2 overflow interrupt(s)

IEN1.6

ECM2

Enable T2 Comparator 2 interrupt

IEN1.5

ECM1

Enable T2 Comparator 1 interrupt

IEN1.4

ECM0

Enable T2 Comparator 0 interrupt

IEN1.3

ECT3

Enable T2 Capture register 3 interrupt

IEN1.2

ECT2

Enable T2 Capture register 2 interrupt

IEN1.1

ECT1

Enable T2 Capture register 1 interrupt

IEN1.0

ECT0

Enable T2 Capture register 0 interrupt

SU01083

ECT1

ECT2

ECT3

ECM0

ECM1

ECM2

ET2

(LSB)

(MSB)

IEN1 (E8H)

Reset Value = 00H

Figure 11. Timer T2 Interrupt Enable Register (IEN1)

T2MS0

BIT

SYMBOL

FUNCTION

TM2CON.7

TSIS1

Timer T2 16-bit overflow interrupt select

TM2CON.6

T2IS0

Timer T2 byte overflow interrupt select

TM2CON.5

T2ER

Timer T2 external reset enable. When this bit is set,

Timer T2 may be reset by a rising edge on RT2 (P1.5).

TM2CON.4

T2BO

Timer T2 byte overflow interrupt flag

TM2CON.3

T2P1

TM2CON.2

T2P0

TM2CON.1

T2MS1

TM2CON.0

T2MS0

SU01084

T2MS1

T2P0

T2P1

T2BO

T2ER

T2IS0

T2IS1

(LSB)

(MSB)

TM2CON (EAH)

Timer T2 prescaler select

T2P1

T2P0

Timer T2 Clock

Clock source

Clock source/2

Clock source/4

Clock source/8

Timer T2 mode select

Timer T2 halted (off)

T2 clock source = fOSC/12

Test mode; do not use

T2 clock source = pin T2

T2MS1

T2MS0

Mode Selected

Reset Value = 00H

Figure 12. T2 Control Register (TM2CON)

P87C554 Datasheet(PDF) 18 Page - NXP Semiconductors

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