T89C51CC02 Atmel, T89C51CC02 Datasheet - Page 52

• Manufacturer Part Number: T89C51CC02
• Description: 8-Bit MCU
• Manufacturer: Atmel

T89C51CC02
12.3.2. Mode 1 (16-bit Timer)
Mode 1 configures Timer 0 as a 16-bit Timer with TH0 and TL0 registers connected in cascade (see Figure 35).
The selected input increments TL0 register.
12.3.3. Mode 2 (8-bit Timer with Auto-Reload)
Mode 2 configures Timer 0 as an 8-bit Timer (TL0 register) that automatically reloads from TH0 register (see
Figure 36). TL0 overflow sets TF0 flag in TCON register and reloads TL0 with the contents of TH0, which is
preset by software. When the interrupt request is serviced, hardware clears TF0. The reload leaves TH0 unchanged.
The next reload value may be changed at any time by writing it to TH0 register.
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INTx#
INTx#
INTx#
PERIPH
PERIPH
PERIPH
CLOCK
CLOCK
CLOCK
Tx
Tx
Tx
TMOD reg
TMOD reg
TMOD reg
GATEx
GATEx
GATEx
6
6
6
TMOD reg
TMOD reg
TMOD reg
C/Tx#
C/Tx#
C/Tx#
0
1
0
1
0
1
Figure 34. Timer/Counter x (x= 0 or 1) in Mode 0
Figure 35. Timer/Counter x (x= 0 or 1) in Mode 1
Figure 36. Timer/Counter x (x= 0 or 1) in Mode 2
TCON reg
TCON reg
TCON reg
TRx
TRx
TRx
Preliminary
(8 bits)
(8 bits)
THx
THx
(8 bits)
(8 bits)
THx
TLx
(5 bits)
(8 bits)
TLx
TLx
Overflow
Overflow
Overflow
TCON reg
TCON reg
TCON reg
TFx
TFx
TFx
Rev.A - May 17, 2001
Timer x
Interrupt
Request
Timer x
Interrupt
Request
Timer x
Interrupt
Request