Rainbow-electronics T89C5115 Uživatelský manuál stáhnout pdf (Strana 54)

T89C5115

4128A–8051–04/02

Table 32. TMOD Register

TMOD (S:89h)

Timer/Counter Mode Control Register

Notes: 1. Reloaded from TH1 at overflow.

2. Reloaded from TH0 at overflow.

Reset Value = 0000 0000b

76543210

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

Bit

Number

Bit

Mnemonic Description

7GATE1

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.

6C/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.

5M11Timer 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 1 Mode 3: Timer 1 halted. Retains count.

1 0 Mode 2: 8-bit auto-reload Timer/Counter (TL1).

(1)

4M01

3GATE0

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.

2C/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.

1M10

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).

(2)

1 1 Mode3:TL0isan8-bitTimer/Counter.

TH0isan8-bitTimerusingTimer1’sTR0andTF0bits.

0M00

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 104 105

T89C5115 1
4128A–8051–04/02 /xM 105

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