7906 datasheet(133/531 Pages) RENESAS

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TIMER A

7906 Group User’s Manual Rev.2.0

7-30

Timer Aj mode register (j = 0 to 2, 4, 9) (Addresses 5616 to 5816, 5A16, DA16)

Operating mode select bits

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

Trigger select bits

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

Count source select bits

b7 b6 b5 b4 b3 b2 b1 b0

1 0 : One-shot pulse mode

b1 b0

0 0 :

Writing “1” to one-shot start bit

0 1 :

(TAjIN pin functions as a programmable I/O

port pin.)

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

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

b4 b3

See Table 7.2.3.

Undefined

15 to 0

Any value in the range from “000016” to “FFFF16” can be set.

Assuming that the set value = n, the “H” level width of the one-shot pulse which is

output from the TAjOUT pin is expressed as follows :

Timer A0 register (Addresses 4716, 4616)

Timer A1 register (Addresses 4916, 4816)

Timer A2 register (Addresses 4B16, 4A16)

Timer A4 register (Addresses 4F16, 4E16)

Timer A9 register (Addresses CF16, CE16)

(b15)

(b8)

fi: Frequency of count source

Note: Use the MOVM or STA(STAD) instruction for writing to this register.

Writing to this register must be performed in a unit of 16 bits.

fi.

Bit

Function

At reset

R/W

Bit name

Bit

Function

At reset

R/W

Fig. 7.5.1 Structures of timer Aj register and timer Aj mode register in one-shot pulse mode

7.5 One-shot pulse mode

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