Specifications subject to change without notice,contact your sales representatives for the most recent information.

13/26

Ver 2.1

SM79164 08/2006

SyncMOS Technologies International. Inc.

SM79164

Watch Dog Timer Register - System Control Register (SCONF, $BF)

The bit 7 (WDR) of SCONF is Watch Dog TImer Reset bit. It will be set to 1 when reset signal generated by WDT

overflow. User should check WDR bit whenever un-predicted reset happened

4. Reduce EMI Function

The SM79164 allows user to reduce the EMI emission by setting 1 to the bit 0 (ALEI) of SCONF register. This function will

inhibit the clock signal in Fosc/6Hz output to the ALE pin.

5. Pulse Width Modulation (PWM)

The Pulse Width Modulation (PWM) module contains 1 kind of PWM sub module: PWM. PWM also has four 8-bit channels.

5.1 PWM Function Description:

Each PWM channel contains a 8-bit wide PWM data register (PWMDR) to decide number of continuous pulses within a

PWM frame cycle. The value programmed in the register will determine the pulse length of the output. The PWM channel

can be configured as 5-bit or 8-bit resolution. If a channel is configured as 5-bit resolution, only LSB 5 bits are available.

The value of each PWM Data Register (PWMDR) is continuously compared with the content of an internal counter to deter-

mine the state of each PWM channel output pin.

5.2 PWM Registers - P1CON[7:0], PWMC[7:0], PWMD[7:0]

PWM Registers - Port1 Configuration Register (P1CON, $9B)

PWM[7:0]E: When the bit set to one, the corresponding PWM pin is active as PWM function. When the bit reset to zero, the

corresponding PWM pin is active as I/O pin. Five bits are cleared upon reset.

PWM Registers - PWM Control Register (PWMC[7:0], $DE ~ $DB, $D6 ~ $D3)

bit-7

bit-0

WDR

Unused

Unused

Unused

Unused

Unused

OME

ALEI

Read / Write:

R/W

-----

R/W

R/W

Reset value:

0

*****

0

0

PWME7

PWME6

PWME5

PWME4

PWME3

PWME2

PWME1

PWME0

Read / Write:

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

Reset value:

0

0

0

0

0

0

0

0

bit-7

bit-0

Unused

Unused

Unused

Unused

Unused

PBS[7:0]

PFS[7:0]1

PFS[7:0]0

Read / Write:

-

-

-

-

-

R/W

R/W

R/W

Reset value:

*

***

*

0

0

0