M16C65 Datasheet, PDF (428/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
19. Three-Phase Motor Control Timer Function
19.3.3.1 The INV13 Bit in the INVC1 Register
In three-phase mode 1, the INV13 bit can be used to detect whether the cycle of the carrier wave is
the first half or the last half. The INV13 bit is a flag which checks the state of timer A1 reload control
signals. Timer A1 reload control signal becomes 0 while timer A1 is stopped, and the value is
reversed at every start trigger signal for timers A1, A2, and A4. Thus, if the cycle of carrier wave
starts at the first timer B2 underflow, the first half comes when the INV13 bit is 1, and the last half
comes when it is 0. Table 19.14 lists The Relations of the INV13 Bit with Other Factors.
Table 19.14 The Relations of the INV13 Bit with Other Factors
INV13 bit
1
Timer A1 reload control signal
One-shot pulse count value
Value at the TAi1 register
Timer B2 underflow
At an odd number of times
Carrier wave
First half
i = 1, 2, 4
0
Value at the TAi register
At an even number of times
Last half
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
Page 393 of 791