SM39A16M1
8-Bit Micro-controller
16KB with ISP Flash
& 1K+256B RAM embedded
13.1.6 PWMINTF (PWM Interrupt Flag)
Mnemonic: PWMINTF
Address: BCh
7
6
5
4
3
2
1
0
-
Reset
00H
Start Adjust PWMTriggerEN EXTTriggerEN ADCMODE ADCCH[2:0] 00H
PWMTBDIR:
PWM Time Base Count Direction Status(Read only)
0 = counts up
1 = counts down
SEVTIF:
PWMPIF:
Special Event Interrupt Flag
PWM Period Interrupt Flag
13.2 Dead Time
When the half-bridge circuit is applying, at the same time of upper and lower arm turn state period, due to characters of
TON and TOFF, power crystal can not instantaneous complete turn state, so as to cause a short circuit, then must
spare a certain time to allow power crystal turn state.
Each pair of complementary PWM output have a 6 bit down counter, due to produce dead time as below figure, each
dead time unit has a rising edge and falling edge detector, according to the counter and when the value of number is
zero, the output is just converted. As shown in Fig. 13-3.
0 PRE 1)
2( DT
Td
DT 0
Fosc
Td
Td
Compare output
PWM1
PWM0
Fig. 13-3: PWM output Compare
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M069 Ver C SM39A16M1 7/31/2013
- 72 -
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
