7721 datasheet(149/577 Pages) RENESAS

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TIMER A

7721 Group User’s Manual

8–30

8.5 One-shot pulse mode

Fig. 8.5.1 Structures of timer Aj mode register and timer Aj register in one-shot pulse mode

Trigger select bits

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

1 @

Bit name

Functions

Timer Aj mode register (j = 2 to 4) (Addresses 5816 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 register

0 1 : (TAjIN pin functions as a prog-

rammable I/O port.)

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

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

Bit

At reset

Operating mode select bits

(b15)

(b8)

Timer A2 register (Addresses 4B16, 4A16)

Timer A3 register (Addresses 4D16, 4C16)

Timer A4 register (Addresses 4F16, 4E16)

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

TAjOUT pin is expressed as follows :

Undefined

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

fi.

Note: Use the LDM or STA instruction for writing to this register.

Read from or write to this register in a unit of 16 bits.

Functions

Bit

At reset

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