AT89C51ID2-SMSIM ATMEL [ATMEL Corporation], AT89C51ID2-SMSIM Datasheet - Page 21

• Manufacturer Part Number: AT89C51ID2-SMSIM
• Description: 8-bit Flash Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

Timer 0: Clock Inputs
4289A–8051–09/03
Figure 3. Timer 0: Clock Inputs
Note:
SCLKT0 = 0: Timer 0 uses the standard T0 pin as clock input (Standard mode)
SCLKT0 = 1: Timer 0 uses the special Sub Clock as clock input, this feature can be use
as periodic interrupt for time clock.
–
FCLK PERIPH
F
In X2 Mode:
In X1 Mode:
The SCLKT0 bit in OSCCON register allows to select Timer 0 Subsidiary clock.
CLK CPU
Sub Clock
T0 pin
INT0
TR0
Gate
and F
OSCCON
SCLKT0
F
F
CLK PERIPH
1
0
CPU
CPU
:6
=
=
F
F
CLKPERIPH
CLKPERIPH
, for CKRL<>0xFF
TMOD
C/T
1
0
=
=
---------------------------------------------- -
2
---------------------------------------------- -
4
Control
255 CKRL
255 CKRL
F
F
OSCA
OSCA
–
–
Timer 0
AT89C51ID2
21