7702 datasheet(119/217 Pages) RENESAS

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TIMER A

7702/7703 Group User’s Manual

5–31

5.5 One-shot pulse mode

(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 These bits can be set to “000116” to “FFFF16.”

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

width of the one-shot pulse output from the

TAiOUT pin is expressed as follows : n / fi.

Undefined

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

Trigger select bits

Fix this bit to “1” in one-shot pulse mode.

Bit name

Functions

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

1 0 : One-shot pulse mode

0 0 : f2

0 1 : f16

1 0 : f64

1 1 : f512

b7 b6

Count source select bits

b1 b0

b4 b3

Fix this bit to “0” in one-shot pulse mode.

0 0 : Writing “1” to one-shot start bit

0 1 :

pin functions as a progra-

mmable I/O port.)

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

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

Bit

At reset

Operating mode select bits

Fig. 5.5.1 Structures of timer Ai mode register and timer Ai register in one-shot pulse mode

(TAi

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