P89LV51RD2BA PHILIPS [NXP Semiconductors], P89LV51RD2BA Datasheet - Page 28

• Manufacturer Part Number: P89LV51RD2BA
• Description: 8-bit 80C51 3 V low power 64 kB Flash microcontroller with 1 kB RAM
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
9397 750 14342
Product data
Table 14:
Not bit addressable; Reset value: 00000000B; Reset source(s): any source
Table 15:
Table 16:
Table 17:
Bit addressable; Reset value: 00000000B; Reset source(s): any reset
Table 18:
Bit
M1
0
0
1
1
1
Bit
7
6
5
4
Bit
Symbol
Bit
Symbol
T1GATE
TMOD - Timer/Counter mode control register (address 89H) bit allocation
TMOD - Timer/Counter mode control register (address 89H) bit description
TMOD - Timer/Counter mode control register (address 89H) M1/M0 operating
mode
TCON - Timer/Counter control register (address 88H) bit allocation
TCON - Timer/Counter control register (address 88H) bit description
Symbol
T1/T0
GATE
C/T
Symbol
TF1
TR1
TF0
TR0
TF1
M0
0
1
0
1
1
7
7
Rev. 04 — 02 December 2004
T1C/T
TR1
6
6
Description
Bits controlling Timer1/Timer0
Gating control when set. Timer/Counter ‘x’ is enabled only while
‘INTx’ pin is HIGH and ‘TRx’ control pin is set. When cleared,
Timer ‘x’ is enabled whenever ‘TRx’ control bit is set.
Gating Timer or Counter Selector cleared for Timer operation
(input from internal system clock.) Set for Counter operation (input
from ‘Tx’ input pin).
Description
Timer 1 overflow flag. Set by hardware on Timer/Counter overflow.
Cleared by hardware when the processor vectors to Timer 1
Interrupt routine, or by software.
Timer 1 Run control bit. Set/cleared by software to turn
Timer/Counter 1 on/off.
Timer 0 overflow flag. Set by hardware on Timer/Counter overflow.
Cleared by hardware when the processor vectors to Timer 0
Interrupt routine, or by software.
Timer 0 Run control bit. Set/cleared by software to turn
Timer/Counter 0 on/off.
Operating mode
0
1
2
3
3
T1M1
TF0
5
5
P89LV51RB2/RC2/RD2
T1M0
8048 timer ‘TLx’ serves as 5-bit prescaler
16-bit Timer/Counter ‘THx’ and ‘TLx' are
cascaded; there is no prescaler.
8-bit auto-reload Timer/Counter ‘THx’ holds a
value which is to be reloaded into ‘TLx’ each
time it overflows.
(Timer 0) TL0 is an 8-bit Timer/Counter
controlled by the standard Timer 0 control bits.
TH0 is an 8-bit timer only controlled by Timer 1
control bits.
(Timer 1) Timer/Counter 1 stopped.
TR0
4
4
8-bit microcontrollers with 80C51 core
T0GATE
IE1
3
3
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
T0C/T
IT1
2
2
T0M1
IE0
1
1
T0M0
28 of 77
IT0
0
0