NEC PD703114 User Manual page 379

V850e/ia2 32-bit single-chip microcontrollers

Table of Contents

(5) Timer 3 output control register (TO3C)

TO3C is a register that controls output of the TO3 pin.

This register can be read/written in 8-bit or 1-bit units.

Caution The TO3 output stop status can be canceled by writing 0 to the TO3SP bit of this register.

Bit position

The following table indicates the relationship between the setting of each register and the status of the TO3,

P27, and INTP31 pins.

Table 9-14. Relationship Between Setting of Each Register and Status of TO3, P27, and INTP31 Pins

Note If the TO3SP bit is set to 1 in TO3 output mode (PMC27 bit = 1 and PFC27 bit = 1), the output buffer of the

TO3 pin is turned off and the TO3 pin goes into a high-impedance state if the specified valid interrupt edge

is generated on the INTP4 pin.

To avoid turning off the output drive by valid edge input to the INTP4 pin, be sure to clear the TO3SP bit to

The valid edge of the INTP4 pin is specified by bit 0 (ES40) and bit 1 (ES41) of the INTM2 register.

Specifying the valid edge of the INTP4 pin (changing the ES40 and ES41 bits) is prohibited while timer 3 is

×: Don't care (does not have to be set)

CHAPTER 9 TIMER/COUNTER FUNCTION

Validates or invalidates output stop control of the TO3 pin by INTP4 pin input.

0: Invalidates INTP4 pin input

(TO3 output (the output buffer of the TO3 pin is on)).

1: Validates INTP4 pin input

(TO3 output is stopped by the valid edge of the INTP4 pin (the output buffer of

the TO3 pin is off and the TO3 pin goes into a high-impedance state)).

Operation Mode of Pin

Output port mode

Input port mode

INTP31 input mode

TO3 output mode

User's Manual U15195EJ5V0UD

TO3/P27/INTP31

Output Buffer Status

Pin Function