ELAN Home Systems EM78P458AM, EM78P459AK Increment Timer Counter Tmrx TMR1H/TWR1L or TMR2H/TWR2L

EM78P458/459

OTP ROM

				DT1H	DL1H + DL1L latch		To PWM1IF
Fosc				+
				DT1L		Duty Cycle
1:2
					Comparator	Match
1:8							PWM1
	MUX
1:32						R	Q
1:64
				TMR1H + TMR1L
					reset	S
							IOC51
	T1P0	T1P1	T1EN		Comparator	Period
				PRD1		Match
Data Bus							Data Bus
					DL2H + DL2L	latch	To PWM2IF
				DT2H
	T2P0	T2P1	T2EN	+		Duty Cycle
				DT2L	Comparator
						Match
Fosc							PWM2
						R	Q
				TMR2H + TMR2L
1:2
					reset	S
1:8	MUX
1:32
					Comparator		IOC51
1:64
						Period
						Match
				PRD2

Fig. 13 The Functional Block Diagram of the Dual PWMs

Period

Duty Cycle

PRD1 = TMR1

DT1 = 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. 38 07.01.2003 (V1.3)