AT89C5132-ROTIL datasheet(51/181 Pages) ATMEL

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4173D–USB–02/06

AT89C5132

12.3.2

Mode 1 (16-bit Timer)

Mode 1 configures Timer 0 as a 16-bit Timer with TH0 and TL0 registers connected in cascade

(see Figure 12-4). The selected input increments TL0 register. Figure 12-5 gives the overflow

period calculation formula when in timer mode.

Figure 12-4. Timer/Counter x (x = 0 or 1) in Mode 1

Figure 12-5. Mode 1 Overflow Period Formula

12.3.3

Mode 2 (8-bit Timer with Auto-Reload)

Mode 2 configures Timer 0 as an 8-bit Timer (TL0 register) that automatically reloads from TH0

contents of TH0, which is preset by software. When the interrupt request is serviced, hardware

clears TF0. The reload leaves TH0 unchanged. The next reload value may be changed at any

time by writing it to TH0 register. Figure 12-7 gives the autoreload period calculation formula

when in timer mode.

Figure 12-6. Timer/Counter x (x = 0 or 1) in Mode 2

Figure 12-7. Mode 2 Autoreload Period Formula

12.3.4

Mode 3 (Two 8-bit Timers)

Mode 3 configures Timer 0 such that registers TL0 and TH0 operate as separate 8-bit Timers

(see Figure 12-8). This mode is provided for applications requiring an additional 8-bit Timer or

TRx

TCON Reg

TFx

TCON Reg

GATEx

TMOD Reg

Overflow

Timer x

Interrupt

Request

C/Tx#

TMOD Reg

TLx

(8 Bits)

THx

(8 Bits)

INTx

TIMx

CLOCK

÷ 6

⋅ (65536 – (THx, TLx))

TFx

PER=

TIMx

TRx

TCON Reg

TFx

TCON Reg

GATEx

TMOD Reg

Overflow

Timer x

Interrupt

Request

C/Tx#

TMOD Reg

TLx

(8 Bits)

THx

(8 Bits)

INTx

TIMx

CLOCK

÷ 6

TFx

PER=

TIMx

⋅ (256 – THx)

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