P87C554 NXP Semiconductors, P87C554 Datasheet - Page 18

• Manufacturer Part Number: P87C554
• Description: The P87C554 Single-Chip 8-Bit Microcontroller is manufactured inan advanced CMOS process and is a derivative of the 80C51microcontroller family
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2002 Mar 25
80C51 8-bit microcontroller – 12 clock operation
16K/512 OTP/RAM, 8 channel 10-bit A/D, I
capture/compare, high I/O
TM2CON (EAH)
IEN1 (E8H)
BIT
IEN1.7
IEN1.6
IEN1.5
IEN1.4
IEN1.3
IEN1.2
IEN1.1
IEN1.0
BIT
TM2CON.7
TM2CON.6
TM2CON.5
TM2CON.4
TM2CON.3
TM2CON.2
TM2CON.1
TM2CON.0
(MSB)
(MSB)
T2IS1
ET2
7
7
ECM2
T2IS0
Figure 11. Timer T2 Interrupt Enable Register (IEN1)
SYMBOL
ET2
ECM2
ECM1
ECM0
ECT3
ECT2
ECT1
ECT0
6
6
SYMBOL
TSIS1
T2IS0
T2ER
T2BO
T2P1
T2P0
T2MS1
T2MS0
Figure 12. T2 Control Register (TM2CON)
T2MS1 T2MS0
T2P1
0
0
1
1
0
0
1
1
ECM1
T2ER
5
5
FUNCTION
Enable Timer T2 overflow interrupt(s)
Enable T2 Comparator 2 interrupt
Enable T2 Comparator 1 interrupt
Enable T2 Comparator 0 interrupt
Enable T2 Capture register 3 interrupt
Enable T2 Capture register 2 interrupt
Enable T2 Capture register 1 interrupt
Enable T2 Capture register 0 interrupt
T2P0
2
Timer T2 prescaler select
Timer T2 mode select
FUNCTION
Timer T2 16-bit overflow interrupt select
Timer T2 byte overflow interrupt select
Timer T2 external reset enable. When this bit is set,
Timer T2 may be reset by a rising edge on RT2 (P1.5).
Timer T2 byte overflow interrupt flag
0
1
0
1
0
1
0
1
ECM0
T2BO
C, PWM,
4
4
16
Mode Selected
Clock source
Clock source/2
Clock source/4
Clock source/8
Timer T2 halted (off)
T2 clock source = f
Test mode; do not use
T2 clock source = pin T2
Timer T2 Clock
ECT3
T2P1
3
3
ECT2
T2P0
2
2
OSC
T2MS1
ECT1
1
1
/12
T2MS0
ECT0
(LSB)
(LSB)
0
0
Reset Value = 00H
Reset Value = 00H
P87C554
Product data
SU01083
SU01084