ELAN Home Systems EM78P458 - Manual (Page 38)

EM78P458/459
OTP ROM
Data Bus Data Bus
PRD1
Com parator
Com parator
TM R1H + TM R1L
S
R Q
M UX
Duty Cycle
M atch
Period
M atch
PW M 1
T1P0 T1P1 T1EN
IOC51
PRD2
Com parator
Com parator
S
R Q
M UX
Duty Cycle
M atch
Period
M atch
PW M 2
T2P0 T2P1 T2EN
IOC51
To PW M 1IF
To PW M 2IF
reset
reset
latch
latch
1:2
1:8
1:32
Fosc
1:64
1:2
1:8
1:32
Fosc
1:64
TM R2H + TM R2L
DT2H
+
DT2L
DT1H
+
DT1L
DL2H + DL2L
DL1H + DL1L
Fig. 13 The Functional Block Diagram of the Dual PWMs
Period
Duty Cycle
DT1 = TMR1
PRD1 = TMR1
Fig. 14 The Output Timing of the PWM
2. Increment Timer Counter ( TMRX: TMR1H/TWR1L or TMR2H/TWR2L )
TMRX are ten-bit clock counters with programmable prescalers. They are designed for the PWM
module as baud rate clock generators. TMRX can be read, written, and cleared at any reset
conditions. If employed, they can be turned down for power saving by setting T1EN bit
[PWMCON<4>] or T2EN bit [PWMCON<5>] to 0.
This specification is subject to change without prior notice. 07.01.2003 (V1.3) 38