EM78P451SWM datasheet(16/54 Pages) EMC

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EM78P451S

8-Bit Microcontroller with OTP ROM

•

Product Specification (V1.0) 06.01.2004

(This specification is subject to change without further notice)

Bit2 (TM1E): Timer1 Function Enable bit

0 = Disable timer1 function as default.

1 = Enable timer1 function.

Bit1~Bit0 (TM1P): Timer1 Prescaler bit

Timer1 prescaler table for FOSC will be illustrated in the Section on

Timer1 in later pages.

4.2.5

IOCD (Pull-high Control Register)

/PU9

/PU8

/PU6

/PU5

The default values of /PU5, /PU6, /PU8, and /PU9 are one, which means the

pull-high function is disabled.

/PU6 and /PU9 are “AND” gating with /PHEN, that is, when each one is written as

“0” pull high is enabled.

S7 defines the driving ability of the P70-P72.

0: Normal output.

1: Enhance the driving ability of LED.

4.2.6

IOCE (WDT Control Register)

ODE

WDTE

SLPC

ROC

/WUE

Bits 7, and1~2 Not used.

Bit 6 (ODE) Open-drain control bit.

0: Both P76 and P77 are normally I/O pins.

1: Both P76 and P77 pins have the open-drain function inside.

The ODE bit can be read and written.

Bit 5 (WDTE) Control bit used to enable Watchdog timer.

The WDTE bit can be used only if ENWDT, the CODE Option bit, is "1". If

the ENWDT bit is "1", then WDT can be disabled/enabled by the WDTE bit.

0: Disable WDT.

1: Enable WDT.

The WDTE bit is not used if ENWDT, the CODE Option bit ENWDT, is "0".

That is, if the ENWDT bit is "0", WDT is always disabled no matter what the

WDTE bit is.

The WDTE bit can be read and written.

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