EM78P458AP datasheet(38/76 Pages) EMC

38 / 76 page

EM78P458/459

OTP ROM

Data Bus

PRD1

Com parator

TM R1H + TM R1L

MUX

Duty Cycle

Match

Period

Match

PWM1

T1P0

T1P1 T1EN

IOC51

PRD2

Com parator

MUX

Duty Cycle

Match

Period

Match

PWM2

T2P0

T2P1 T2EN

IOC51

To PW M 1IF

To PW M 2IF

reset

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.

3. PWM Period ( PRDX : PRD1 or PRD2 )

The PWM period is defined by writing to the PRDX register. When TMRX is equal to PRDX, the

This specification is subject to change without prior notice.

06.25.2004 (V1.4)

EM78P458AP Datasheet(PDF) 38 Page - ELAN Microelectronics Corp

EM78P458AP Datasheet(HTML) 38 Page - ELAN Microelectronics Corp

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