AT89C51CC03U-S3SIM ATMEL [ATMEL Corporation], AT89C51CC03U-S3SIM Datasheet - Page 70

• Manufacturer Part Number: AT89C51CC03U-S3SIM
• Description: Enhanced 8-bit MCU with CAN Controller and Flash Memory
• Manufacturer: ATMEL [ATMEL Corporation]

Mode 0 (13-bit Timer)
Figure 35. Timer/Counter x (x = 0 or 1) in Mode 0
Mode 1 (16-bit Timer)
Figure 36. Timer/Counter x (x = 0 or 1) in Mode 1
70
INTx#
See the “Clock” section
INTx#
See the “Clock” section
AT89C51CC03
CLOCK
CLOCK
FTx
Tx
FTx
Tx
TMOD reg
GATEx
TMOD reg
GATEx
÷ 6
÷ 6
TMOD reg
TMOD reg
C/Tx#
C/Tx#
Mode 0 configures Timer 0 as an 13-bit Timer which is set up as an 8-bit Timer (TH0
register) with a modulo 32 prescaler implemented with the lower five bits of TL0 register
(see Figure 35). The upper three bits of TL0 register are indeterminate and should be
ignored. Prescaler overflow increments TH0 register.
Mode 1 configures Timer 0 as a 16-bit Timer with TH0 and TL0 registers connected in
cascade (see Figure 36). The selected input increments TL0 register.
0
1
0
1
TCON reg
TCON reg
TRx
TRx
(8 bits)
(8 bits)
THx
THx
(8 bits)
(5 bits)
TLx
TLx
Overflow
Overflow
TCON reg
TCON reg
TFx
TFx
4182I–CAN–06/05
Timer x
Interrupt
Request
Timer x
Interrupt
Request