AT83SND1CXXX-ROTIL datasheet(54/212 Pages) ATMEL

54 / 212 page

4109J–8051–10/06

AT8xC51SND1C

Figure 10-3. Mode 0 Overflow Period Formula

10.3.2

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 10-4). The selected input increments TL0 register. Figure 10-5 gives the overflow

period calculation formula when in timer mode.

Figure 10-4. Timer/Counter x (x = 0 or 1) in Mode 1

Figure 10-5. Mode 1 Overflow Period Formula

10.3.3

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 10-7 gives the autoreload period calculation formula

when in timer mode.

Figure 10-6. Timer/Counter x (x = 0 or 1) in Mode 2

Figure 10-7. Mode 2 Autoreload Period Formula

⋅ (16384 – (THx, TLx))

TFx

PER=

FTIMx

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))

TFxPER=

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

TFxPER=

TIMx

⋅ (256 – THx)

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