W77C32 datasheet(55/78 Pages) WINBOND

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W77C32/W77C032A

Publication Release Date: February 1, 2007

- 55 -

Revision A8

1/4

1/12

T2M = CKCON.5

C/T2 = T2CON.1

T2CON.7

T2 = P1.0

T2CON.6

TR2 = T2CON.2

T2EX = P1.1

EXEN2 = T2CON.3

EXF2

Timer 2

Interrupt

TF2

TH2

TL2

RCAP2H

RCAP2L

Clock Source

Mode

input

div. by 4

osc/1

div. by 64

osc/16

div. by 1024 osc/256

Figure 15. 16-Bit Auto-reload Mode, Counting Up

12.2.3 Auto-reload Mode, Counting Up/Down

Timer/Counter 2 will be in auto-reload mode as an up/down counter if CP/ RL2 bit in T2CON is

cleared and the DCEN bit in T2MOD is set. In this mode, Timer/Counter 2 is an up/down counter

whose direction is controlled by the T2EX pin. A 1 on this pin cause the counter to count up. An

overflow while counting up will cause the counter to be reloaded with the contents of the capture

registers. The next down count following the case where the contents of Timer/Counter equal the

capture registers will load an FFFFh into Timer/Counter 2. In either event a reload will set the TF2 bit.

A reload will also toggle the EXF2 bit. However, the EXF2 bit can not generate an interrupt while in

this mode.

C/T = T2CON.1

1/4

1/12

T2M = CKCON.5

Down Counting Reload Value

T2CON

Up Counting Reload

T2 = P1.0

T2CON.6

TR2 = T2CON.2

T2EX = P1.1

EXF2

Timer 2

Interrupt

TF2

TH2

TL2

RCAP2H

RCAP2L

0FFh

DCEN = 1

Clock Source

Mode

input

div. by 4

osc/1

div. by 64

osc/16

div. by 1024 osc/256

Figure 16. 16-Bit Auto-reload Up/Down Counter

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