EM78P451SWM datasheet(18/54 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)

Bit 1 (EXIE) EXIF interrupt enable bit.

0: disable EXIF interrupt

1: enable EXIF interrupt

Bit 0 (TCIE) TCIF interrupt enable bit.

0: disable TCIF interrupt

1: enable TCIF interrupt

O scillator

Ena b le

D isab le

Re se t

CL K

Cle ar

fro m S /W

Set

/W U E

V CC

P60 ~P67

VC C

/W U E

P7 4~P7 5, P90 ~P91

/P HE N

Fig. 5 Block Diagram of Sleep Mode and Wake-up Circuits on I/O Ports

4.3 TCC/WDT Presacler

An 8-bit counter is available as prescaler for the TCC or WDT. The prescaler is

available for either the TCC or WDT only at any given time, and the PAB bit of CONT

determine the prescale ratio. The prescaler is cleared each time the instruction is

written to TCC under TCC mode. The WDT and prescaler, when assigned to WDT

mode, are cleared by the WDTC or SLEP instructions. Fig. 6 depicts the circuit

diagram of TCC/WDT.

R1(TCC) is an 8-bit timer/counter. TCC will increase by one at every instruction

cycle (without prescaler).

EM78P451SWM 数据表(PDF) 18 Page - ELAN Microelectronics Corp

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