7733 datasheet(144/940 Pages) RENESAS

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TIMER A

7733 Group User’s Manual

6–33

6.5 One-shot pulse mode

Fig. 6.5.1 Structures of timer Ai mode register and timer Ai register in one-shot pulse mode

b0 b7

(b15)

(b8)

Timer A0 register (addresses 4716, 4616)

Timer A1 register (addresses 4916, 4816)

Timer A2 register (addresses 4B16, 4A16)

Timer A3 register (addresses 4D16, 4C16)

Timer A4 register (addresses 4F16, 4E16)

Functions

Bit

At reset

15 to 0

Values 000016 to FFFF16 can be set.

Assuming that the set value = n, “H” level

width of the one-shot pulse output from pin

TAiOUT is n/fi.

Undefined

fi: Frequency of the count source (f2, f16, f64, or f512)

Trigger selection bits

Must be fixed to “1” in the one-shot pulse mode.

Operating mode selection

bits

Bit name

Functions

Timer Ai mode register (i = 0 to 4) (addresses 5616 to 5A16)

1 0: One-shot pulse mode

0 0: Clock f2

0 1: Clock f16

1 0: Clock f64

1 1: Clock f512

b7 b6

Count source selection bits

b1 b0

b4 b3

Must be fixed to “0” in the one-shot pulse mode.

Clocks f2, f16, f64, and f512: Refer to chapter “14. CLOCK GENERATING CIRCUIT.”

0 X: Writing “1” to the one-shot start flag (Pin

TAiIN functions as a programmable I/O @ @ @

port.)

1 0: Falling edge of the pin TAiIN’s input signal

1 1: Rising edge of the pin TAiIN’s input signal

Bit

At reset

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