Rev. 1.00, 09/03, page 339 of 704
PWM Mode 1:
PWM output is generated from the TIOCA and TIOCC pins by pairing TGRA with TGRB and
TGRC with TGRD. The value specified by bits IOA3 to IOA0 and IOC3 to IOC0 in TIOR is
output from the TIOCA and TIOCC pins at compare matches A and C, and the value specified by
bits IOB3 to IOB0 and IOD3 to IOD0 in TIOR is output at compare matches B and D. The initial
output value is the value set in TGRA or TGRC. When the set values of paired TGRs are identical,
the output value does not change even if a compare match occurs.
In PWM mode 1, a maximum 4-phase PWM output is possible.
PWM Mode 2:
PWM output is generated using one TGR as the periodic register and the others as duty registers.
The value specified in TIOR is output by means of compare matches. Upon counter clearing by a
synchronous register compare match, the output value of each pin is the initial value set in TIOR.
When the set values of the periodic and duty registers are identical, the output value does not
change even if a compare match occurs.
In PWM mode 2, a maximum 7-phase PWM output is possible by combined use with synchronous
operation.
The correspondence between PWM output pins and registers is shown in table 12.19.
Table 12.19 PWM Output Registers and Output Pins
Output
Pins
Channel
Registers
PWM Mode 1
PWM Mode 2
TGRA_0 TIOCA0
TGRB_0
TIOCA0
TIOCB0
TGRC_0 TIOCC0
0
TGRD_0
TIOCC0
TIOCD0
TGRA_1 TIOCA1
1
TGRB_1
TIOCA1
TIOCB1
TGRA_2 TIOCA2
2
TGRB_2
TIOCA2
TIOCB2
Note: In PWM mode 2, PWM output is not possible for TGR in which the period is set.
Summary of Contents for H8S/2437
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