Rainbow-electronics T89C51CC01 Bedienungsanleitung PDF herunterladen (Seite 54)

T89C51CC01

Rev. D – 17-Dec-01

Figure 22. Timer/Counter x (x= 0 or 1) in Mode 0

12.2.2 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 23). The selected input increments TL0 register.

Figure 23. Timer/Counter x (x= 0 or 1) in Mode 1

12.2.3 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 register (see Figure 24). TL0 overflow sets TF0 flag in TCON register and

reloads TL0 with the 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 24. Timer/Counter x (x= 0 or 1) in Mode 2

FTx

CLOCK

TRx

TCON reg

TFx

TCON reg

GATEx

TMOD reg

÷ 6

Overflow

Timer x

Interrupt

Request

C/Tx#

TMOD reg

TLx

(5 bits)

THx

(8 bits)

INTx#

see section “Clock”

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#

FTx

CLOCK

÷ 6

see section “Clock”

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#

FTx

CLOCK

÷ 6

see section “Clock”

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