AT89C51CC03C-RLTIM View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
AT89C51CC03C-RLTIM Datasheet PDF : 197 Pages
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Table 31. TMOD Register
TMOD (S:89h)
Timer/Counter Mode Control Register
7
6
5
4
3
2
1
0
GATE1
C/T1#
M11
M01
GATE0
C/T0#
M10
M00
Bit
Bit
Number Mnemonic Description
Timer 1 Gating Control Bit
7
GATE1 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.
Timer 1 Counter/Timer Select Bit
6
C/T1# 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.
5
M11 Timer 1 Mode Select Bits
M11 M01 Operating mode
0
0 Mode 0: 8-bit Timer/Counter (TH1) with 5-bit prescaler (TL1).
4
M01
0
1
1 Mode 1: 16-bit Timer/Counter.
0 Mode 2: 8-bit auto-reload Timer/Counter (TL1) (1)
1
1 Mode 3: Timer 1 halted. Retains count
Timer 0 Gating Control Bit
3
GATE0 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.
Timer 0 Counter/Timer Select Bit
2
C/T0# 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.
Timer 0 Mode Select Bit
1
M10 M10 M00 Operating mode
0
0 Mode 0: 8-bit Timer/Counter (TH0) with 5-bit prescaler (TL0).
0
1 Mode 1: 16-bit Timer/Counter.
1
0 Mode 2: 8-bit auto-reload Timer/Counter (TL0) (2)
0
M00
1
1 Mode 3: TL0 is an 8-bit Timer/Counter
TH0 is an 8-bit Timer using Timer 1’s TR0 and TF0 bits.
1.
Reloaded from TH1 at overflow.
2.
Reloaded from TH0 at overflow.
Reset Value = 0000 0000b
74 AT89C51CC03
4182K–CAN–05/06
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