7733 datasheet(185/940 Pages) RENESAS

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TIMER B

7733 Group User’s Manual

7–22

7.4.3 Selectable functions

Timer B1 internal connection is described below.

(1) Timer B1 internal connection

When the timer B1 internal connect selection bit (bit 2 at address 6D16) is set to “1,” timer B1 is

internally connected to timer B2 and counts the timer B2’s underflow signal. Accordingly, timers B2

and B1 function as a 32-bit (16 bits + 16 bits) timer and counts the timer B2’s count source.

This function can be used when timer B2 operates in the timer or event counter mode, or as a clock

timer.

Figure 7.4.4 shows connection between timers B2 and B1 when timer B1 internal connection is

selected. Figure 7.4.5 shows structures of the timer B1 mode register and port function control register

when timer B1 internal connection is selected. Figure 7.4.6 shows an operation example when timer

B1 internal connection is selected.

Fig. 7.4.4 Connection between timers B2 and B1 when timer B1 internal connection is selected

Timer B1 mode register (address 5C16)

Port function control register (address 6D16)

X: It may be “0” or “1.”

Fig. 7.4.5 Structures of timer B1 mode register and port function control register when timer B1

internal connection is selected

Timer B1

(Event counter mode)

Timer B1

interrupt request bit

Counter (16)

Timer B2 count source

TB1IN

Timer B2

interrupt request bit

Reload register

(16)

Timer B2

Timer mode

Event counter mode

Clock timer

Timer B1

internal

connect

selection bit

Counter (16)

Reload register

(16)

7.4 Event counter mode

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