Rainbow-electronics T89C51CC02 Manual de usuario descargar pdf (Pagina 56)

56 Rev.A - May 17, 2001

Preliminary

T89C51CC02

TMOD (S:89h)

Timer/Counter Mode Control Register.

Reset Value= 0000 0000b

Figure 40. TMOD Register

TH0 (S:8Ch)

Timer 0 High Byte Register.

Reset Value= 0000 0000b

Figure 41. TH0 Register

7 6 5 4 3 2 1 0

GATE1 C/T1# M11 M01 GATE0 C/T0# M10 M00

Bit Number Bit Mnemonic Description

7 GATE1

Timer 1 Gating Control Bit

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.

6 C/T1#

Timer 1 Counter/Timer Select Bit

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).

0 1 Mode 1: 16-bit Timer/Counter.

1 0 Mode 2: 8-bit auto-reload Timer/Counter (TL1). Reloaded from TH1 at overflow.

1 1 Mode 3: Timer 1 halted. Retains count.

4 M01

3 GATE0

Timer 0 Gating Control Bit

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.

2 C/T0#

Timer 0 Counter/Timer Select Bit

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.

1 M10

Timer 0 Mode Select Bit

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). Reloaded from TH0 at overflow.

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.

M00

7 6 5 4 3 2 1 0

Bit Number Bit Mnemonic Description

7:0 High Byte of Timer 0.

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 136 137

T89C51CC02 1

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