HD6413007F20 Datasheet, PDF (336/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

9. 16-Bit Timer
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
0
1
2
Abbreviation
GRA0, GRB0
GRA1, GRB1
GRA2, GRB2
Function
Output compare/input capture register
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Initial value 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W 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 valid edge or 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 initialized to the output compare function (with no output signal) by a reset
and in standby mode. The initial value is H'FFFF.
Rev.5.00 Sep. 12, 2007 Page 306 of 764
REJ09B0396-0500