7721 datasheet(484/577 Pages) RENESAS

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APPENDIX

Appendix 3. Control registers

7721 Group User’s Manual

17–21

One-shot pulse mode

(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)

Trigger select bits

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

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

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.

Bit

Functions

At reset

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