MC81F4332 Datasheet, PDF (135/198 Pages) Finechips – ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

MC81F4432
20. High Speed PWM
fxx/1024
fxx/256
fxx/64
fxx/16
fxx/8
fxx/4
fxx/2
fxx/1
fxt
EC2
Counter stop
M
U
X
T2CS
2-bit
8-Bit Up Counter
(Read - only)
R
Clear
T2CR
2-bit 8-Bit Comparator
Match
2-bit Timer 2 Buffer Register
PPH,
PPL
2-bit Timer 2 Data Register
T2DR
2-bit 8-Bit Comparator
T2CC
Match signal
TO2vCeCrflow _signal
Match signal
T2MIE
Timer 2 Match INT enable
T2MIR
Timer 2 Match INT request
T2F
T2 Match
Interrupt
SQ
R
M
U
PWM2O
X
2-bit PWM 2 Buffer Register
P2DH,
P2DL
2-bit PWM 2 Data Register
2-bit 8-Bit Comparator
2-bit 8-Bit Comparator
POL2
SQ
R
POL3
SQ
2-bit PWM 3 Buffer Register
2-bit PWM 4 Buffer Register
T2CC
Match signal
2-bit PWM 3 Data Register
2-bit PWM 4 Data Register
P3DH,
P4DH,
P3DL
P4DL
NOTE:
1. When you cleared the POLx and counter stop, PWMxO is high status.
2. When you set the POLx and counter stop, PWMxO is low status.
(x=2, 3, 4)
R
POL4
T2CC
Match signal
Figure 20-1 High Speed PWM Block Diagram
Counter stop
M
U
PWM3O
X
Counter stop
M
U
PWM4O
X
Counter stop
The MC81F4x32 has three high speed PWM (Pulse Width Modulation) function which shared with
Timer2.
In PWM mode, the R11/PWM2O, R12/PWM3O, R13/PWM4O pins operate as a 10-bit resolution
PWM output port. For this mode, the R11 of R1CONL, the R12 and the R13 of R1CONM should be
set to alternative function mode.
The period of the PWM output is determined by the T2DR (T2 data Register) and PWMPDR[1:0]
(PWM Period Duty Register) and the duty of the PWM output is determined by the PWM2DR,
PWM3DR, PWM4DR (PWM Data Register) and PWMPDR[7:2] (PWM Period Duty Register).
User can use PWM data by writing the lower 8-bit period value to the T2DR and the higher 2-bit
period value to the PWMPDR[1:0]. And the duty value can be used with the PWM2DR, PWM3DR,
PWM4DR and the PWMPDR[7:2] in the same way.
October 19, 2009 Ver.1.35
135