TMP91C829 Datasheet, PDF(109/204 Page) Toshiba Semiconductor

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TMP91C829 Datasheet, PDF (109/204 Pages) Toshiba Semiconductor – Original CMOS 16-Bit Microcontroller

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TMP91C829

(5) Capture input control

This circuit controls the timing to latch the value of up counter UC0 into TB0CP0,

TB0CP1. The latch timing for the capture register is determined by

TB0MOD<TB0CPM1:0>.

In addition, the value in the up counter can be loaded into a capture register by

software. Whenever 0 is written to TB0MOD<TB0CP0I>, the current value in the up

counter is loaded into capture register TB0CP0. It is necessary to keep the prescaler in

run mode (e.g., TB0RUN<TB0PRUN> must be held at a value of 1).

Note:

As described above, whenever 0 is written to TB0MOD<TB0CP0I>, the current

value in the up counter is loaded into capture register TB0CP0. However, note that

the current value in the up counter is also loaded into capture register TB0CP0

when 1 is written to TB0MOD<TB0CP0I> while this bit is holding 0.

Note

Write to TBnMOD

â0â WR

â1â WR

TBnMOD

Capture

operation

Capture Capture Capture

NOP

(6) Comparators (CP0 and CP1)

CP0 and CP1 are 16-bit comparators which compare the value in the up counter UC0

with the value set in TB0RG0 or TB0RG1 respectively, in order to detect a match. If a

match is detected, the comparator generates an interrupt (INTTB00 or INTTB01

respectively).

(7) Timer flip-flops (TB0FF0 and TB0FF1)

These flip-flops are inverted by the match detect signals from the comparators and

the latch signals to the capture registers. Inversion can be enabled and disabled for

each element using TB0FFCR<TB0C1T1, TB0C0T1, TB0E1T1, TB0E0T1>. After a

reset the value of TB0FF0 is undefined. If 00 is written to TB0FFCR<TB0FF0C1:0> or

<TB0FF1C1:0>, TB0FF0 will be inverted. If 01 is written to the capture registers, the

value of TB0FF0 will be set to 1. If 10 is written to the capture registers, the value of

TB0FF0 will be set to 0. The values of TB0FF0 and TB0FF1 can be output via the timer

output pins TB0OUT0 (which is shared with P95) and TB0OUT1 (which is shared with

P96). Timer output should be specified using the port 9 function register.

91C829-107

2006-03-15

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