EM78452WM datasheet(44/54 Pages) EMC

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EM78452

8-Bit Microcontroller

•

Product Specification (V1.0) 10.18.2007

(This specification is subject to change without further notice)

OSCI

OSCO

XTAL

Fig. 5-18 Circuit for Crystal/Resonator

Table 10 Capacitor Selection Guide for Crystal Oscillator Ceramic Resonators

Oscillator Type

Frequency Mode

Frequency

C1 (pF)

C2 (pF)

455 KHz

10~150

1.0 MHz

40~80

2.0 MHz

20~40

Ceramic Resonator

HXT

4.0 MHz

10~30

455 KHz

20~40

20~150

1.0 MHz

15~30

2.0 MHz

Crystal Oscillator

HXT

4.0 MHz

Fig. 5-19 Circuit for External R, Internal C Oscillator Mode

5.10 Code Option Register :

Word 0

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

ENWDT

CLKS

SPIHSK

REN

SDOS

WUTT

Bit 5 (ENWDT): Watchdog Timer enabled.

0: Enable

1: Disable

Bit 4 (CLKS): Clocks of each instruction cycle.

0: Two clocks

1: Four clocks

Bit 3 (SPIHSK): SPI handshake enable bit

0: enable SPI handshake function. When this bit is set to “0.” In SPI

Slave mode, after SPI control register bit 4(SSE) is set to “1” it will

send a high level through P91 (SRDY). Inform the “master” that the

“Slave” is ready.

1: disable SPI handshake function

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