P80C3XX2_8XC5XX2 NXP Semiconductors, P80C3XX2_8XC5XX2 Datasheet - Page 15

• Manufacturer Part Number: P80C3XX2_8XC5XX2
• Description: The Philips microcontrollers described in this data sheet arehigh-performance static 80C51 designs incorporating Philips?high-density CMOS technology with operation from 2
• Manufacturer: NXP Semiconductors

Philips Semiconductors
2003 Jan 24
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V),
low power, high speed (30/33 MHz)
TMOD
*d = 6 in 6-clock mode; d = 12 in 12-clock mode.
Timer n
Gate bit
INTn Pin
BIT
TMOD.3/
TMOD.7
TMOD.2/
TMOD.6
Address = 89H
Not Bit Addressable
OSC
Tn Pin
SYMBOL
GATE
C/T
M1
0
0
1
1
1
TRn
M0
0
1
0
1
1
d*
FUNCTION
Gating control when set. Timer/Counter “n” is enabled only while “INTn” pin is high and
“TRn” control pin is set. when cleared Timer “n” is enabled whenever “TRn” control bit is set.
Timer or Counter Selector cleared for Timer operation (input from internal system clock.)
Set for Counter operation (input from “Tn” input pin).
OPERATING
8048 Timer: “TLn” serves as 5-bit prescaler.
16-bit Timer/Counter: “THn” and “TLn” are cascaded; there is no prescaler.
8-bit auto-reload Timer/Counter: “THn” holds a value which is to be reloaded
into “TLn” 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.
Figure 1. Timer/Counter 0/1 Mode Control (TMOD) Register
Figure 2. Timer/Counter 0/1 Mode 0: 13-Bit Timer/Counter
GATE
7
C/T = 0
C/T = 1
C/T
6
TIMER 1
M1
5
M0
4
Control
15
GATE
3
C/T
2
TIMER 0
(5 Bits)
TLn
M1
1
(8 Bits)
THn
P80C3xX2; P80C5xX2;
M0
0
Reset Value = 00H
TFn
SU01580
SU01618
P87C5xX2
Interrupt
Product data