T89C51CC02 Atmel, T89C51CC02 Datasheet - Page 56

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

T89C51CC02
TMOD (S:89h)
Timer/Counter Mode Control Register.
Reset Value= 0000 0000b
TH0 (S:8Ch)
Timer 0 High Byte Register.
Reset Value= 0000 0000b
56
Bit Number Bit Mnemonic
Bit Number Bit Mnemonic
GATE1
7:0
7
7
7
6
5
4
3
2
1
0
GATE1
GATE0
C/T1#
C/T1#
C/T0#
M11
M01
M10
M00
6
6
Timer 1 Gating Control Bit
Timer 1 Counter/Timer Select Bit
Timer 1 Mode Select Bits
Timer 0 Gating Control Bit
Timer 0 Counter/Timer Select Bit
Timer 0 Mode Select Bit
High Byte of Timer 0.
Clear to enable Timer 1 whenever TR1 bit is set.
Set to enable Timer 1 only while INT1# pin is high and TR1 bit is set.
Clear for Timer operation: Timer 1 counts the divided-down system clock.
Set for Counter operation: Timer 1 counts negative transitions on external pin T1.
M11
Clear to enable Timer 0 whenever TR0 bit is set.
Set to enable Timer/Counter 0 only while INT0# pin is high and TR0 bit is set.
Clear for Timer operation: Timer 0 counts the divided-down system clock.
Set for Counter operation: Timer 0 counts negative transitions on external pin T0.
M10
M11
0
0
1
1
0
0
1
1
5
5
M01
M00
0
1
0
1
0
1
0
1
Figure 40. TMOD Register
Figure 41. TH0 Register
Preliminary
Operating mode
Mode 0: 8-bit Timer/Counter (TH1) with 5-bit prescaler (TL1).
Mode 1: 16-bit Timer/Counter.
Mode 2: 8-bit auto-reload Timer/Counter (TL1). Reloaded from TH1 at overflow.
Mode 3: Timer 1 halted. Retains count.
Operating mode
Mode 0: 8-bit Timer/Counter (TH0) with 5-bit prescaler (TL0).
Mode 1: 16-bit Timer/Counter.
Mode 2: 8-bit auto-reload Timer/Counter (TL0). Reloaded from TH0 at overflow.
Mode 3: TL0 is an 8-bit Timer/Counter.
TH0 is an 8-bit Timer using Timer 1’s TR0 and TF0 bits.
M01
4
4
GATE0
3
3
Description
Description
C/T0#
2
2
M10
Rev.A - May 17, 2001
1
1
M00
0
0