H8SLASH3028F datasheet(360/923 Pages) RENESAS

360 / 923 page

Rev. 2.00, 09/03, page 330 of 890

9.2.8

General Registers (GRA, GRB)

The general registers are 16-bit registers. The 16-bit timer has 6 general registers, two in each

channel.

Channel

Abbreviation

Function

GRA0, GRB0

Output compare/input capture register

1GRA1, GRB1

2GRA2, GRB2

Bit

Initial value

Read/Write

R/W

A general register is a 16-bit readable/writable register that can function as either an output

compare register or an input capture register. The function is selected by settings in TIOR.

When a general register is used as an output compare register, its value is constantly compared

with the 16TCNT value. When the two values match (compare match), the IMFA or IMFB flag is

set to 1 in TISRA/TISRB. Compare match output can be selected in TIOR.

When a general register is used as an input capture register, an external input capture signal are

detected and the current 16TCNT value is stored in the general register. The corresponding IMFA

or IMFB flag in TISRA/TISRB is set to 1 at the same time. The edges of the input capture signal

are selected in TIOR.

TIOR settings are ignored in PWM mode.

General registers are linked to the CPU by an internal 16-bit bus and can be written or read by

either word access or byte access.

General registers are set as output compare registers (with no pin output) and initialized to H'FFFF

by a reset and in standby mode.

H8/3028F Datasheet(PDF) 360 Page - Renesas Technology Corp