Rev. 1.0, 09/02, page 210 of 568
There are two PWM modes, as described below.
•
PWM mode 1
PWM output is generated from the TIOCA and TIOCC pins by pairing TGRA with TGRB and
TGRC with TGRD. The output specified by bits IOA0 to IOA3 and IOC0 to IOC3 in TIOR is
output from the TIOCA and TIOCC pins at compare matches A and C, and the output
specified by bits IOB0 to IOB3 and IOD0 to IOD3 in TIOR is output at compare matches B
and D. The initial output value is the value set in TGRA or TGRC. If the set values of paired
TGRs are identical, the output value does not change when a compare match occurs.
In PWM mode 1, a maximum 8-phase PWM output is possible.
•
PWM mode 2
PWM output is generated using one TGR as the cycle register and the others as duty cycle
registers. The output specified in TIOR is performed by means of compare matches. Upon
counter clearing by a synchronization register compare match, the output value of each pin is
the initial value set in TIOR. If the set values of the cycle and duty cycle registers are identical,
the output value does not change when a compare match occurs.
In PWM mode 2, a maximum 15-phase PWM output is possible in combination use with
synchronous operation.
The correspondence between PWM output pins and registers is shown in table 10.30.
Table 10.30 PWM Output Registers and Output Pins
Output
Pins
Channel
Registers
PWM Mode 1
PWM Mode 2
0 TGRA_0
TIOCA0
TIOCA0
TGRB_0
TIOCB0
TGRC_0
TIOCC0
TIOCC0
TGRD_0
TIOCD0
1 TGRA_1
TIOCA1
TIOCA1
TGRB_1
TIOCB1
2 TGRA_2
TIOCA2
TIOCA2
TGRB_2
TIOCB2
3 TGRA_3
TIOCA3
TIOCA3
TGRB_3
TIOCB3
TGRC_3
TIOCC3
TIOCC3
TGRD_3
TIOCD3
Содержание H8S/2627
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