em78p5842 ELAN Microelectronics Corp, em78p5842 Datasheet - Page 33

• Manufacturer Part Number: em78p5842
• Description: 8-bit Micro-controller
• Manufacturer: ELAN Microelectronics Corp

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* This specification is subject to change without notice.
• Fosc: Input clock.
• Prescaler (T1P0 and T1P1): Options of 1:2, 1:8, 1:32, and 1:64 are defined by TMRX. It is cleared when
• TMR1X (TMR1H/TWR1L):Timer X register; TMRX is increased until it matches with PRDX, and then is
• PRDX (PRD1): PWM period register.
When defining TMRX, refer to the related registers of its operation as shown in prescale register. It must be
noted that the PWMX bits must be disabled if their related TMRXs are employed. That is, bit 6 of the
PWMCON register must be set to ‘0’.
Related Control Registers(R5 PAGE3) of TMR1 and TMR2
Timer programming procedures/steps
Load PRDX with the TIMER period.
Enable interrupt function by writing IOCF PAGE0, if required
Load a desired value to PWMCON with the TMRX prescaler value and enable both TMRX and disable
PWM2E
any type of reset occurs.
reset to 0. TMRX cannot be read.
Bit 7
PWMX.
Fosc
Fosc
1:2
1:8
1:32
1:64
1:2
1:8
1:32
1:64
Data Bus
PWM1E
Bit 6
T1P0 T1P1 T1EN
T2P0 T2P1 T2EN
MUX
MUX
T2EN
Bit 5
*TMR1X = TMR1H + TMR1L;
*TMR2X = TMR2H +TMR2L
T1EN
Fig.12 TMRX Block Diagram
Bit 4
T2P1
Bit 3
TMR1X
TMR2X
31
T2P0
Bit 2
PRD2
PRD1
T1P1
Bit 1
reset
reset
Comparator
Comparator
T1P0
Bit 0
To PWM2IF
EM785840/5841/5842
8-bit Micro-controller
To PWM1IF
Data Bus
Period
Match
2004/11/10 V1.2
Period
Match