D17133CS datasheet(144/289 Pages) NEC

144 / 289 page

CHAPTER 13

PERIPHERAL HARDWARE

129

13.1.8 Timer Output

The P0D3/TMOUT pin functions as a timer match signal output pin when the TMOSEL flag is set to 1. The P0DBIO3

value has nothing to do with this setting.

Timer contains a match signal output flip-flop. It reverses the output each time the comparator outputs a match

signal. When the TMOSEL flag is set to 1, the contents of this flip-flop are output to the P0D3/TMOUT pin.

The P0D3/TMOUT pin is an N-ch open-drain output pin. The mask option enables this pin to contain a pull-up

resistor. If this pin does not contain a pull-up resistor, its initial status is high impedance.

An internal timer output flip-flop starts operating when TMEN is set to 1. To make the flip-flop start output

beginning at an initial value, set 1 in TMRES and reset the flip-flop.

Remark

The

µPD17P132 and 17P133 have no mask option resistor.

Figure 13-7. Timer Output Control Mode Register

RF: 12H

Read/write

Initial value when reset

Bit 3

Bit 2

Bit 1

Bit 0

TMOSEL

R/W

Read=R, write=W

Timer Output Control

P0D3 /TMOUT pin functions as port.

P0D3 /TMOUT pin functions as timer match

signal output.

TMOSEL

D17133CS Datasheet(PDF) 144 Page - NEC