T89C51AC2-RLSI-M datasheet(62/117 Pages) ATMEL

62 / 117 page

Draft.A - March 30, 2001

Preview - Confidential

T89C51AC2

TMOD (S:89h)

Timer/Counter Mode Control Register.

Reset Value= 0000 0000b

Figure 48. TMOD Register

TH0 (S:8Ch)

Timer 0 High Byte Register.

Reset Value= 0000 0000b

Figure 49. TH0 Register

GATE1

C/T1#

M11

M01

GATE0

C/T0#

M10

M00

Bit Number Bit Mnemonic

Description

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.

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.

M11

Timer 1 Mode Select Bits

M11

M01

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.

M01

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.

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.

M10

Timer 0 Mode Select Bit

M10

M00

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.

M00

Bit Number Bit Mnemonic

Description

7:0

High Byte of Timer 0.

T89C51AC2-RLSI-M 数据表(PDF) 62 Page - ATMEL Corporation

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