EM78P157NAAS datasheet(33/56 Pages) EMC

Part #	EM78P157NAAS

Description	8-Bit Microcontroller with OTP ROM

PDF	56 Pages

Scroll/Zoom	100%

Manufacturer	EMC [ELAN Microelectronics Corp]

Direct Link	http://www.emc.com.tw

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33 / 56 page

EM78P157N

8-Bit Microcontroller with OTP ROM

Product Specification (V1.0) 09.22.2005

• 27

(This specification is subject to change without further notice)

Bit 5 (HLF):

XTAL frequency selection

0: XTAL2 type (low frequency, 32.768KHz)

1: XTAL1 type (high frequency)

This bit will affect system oscillation only when Bit 4 (OSC) is “1.” When

OSC is”0,” HLF must be “0”.

NOTE

The transient point of system frequency between HXT and LXY is around 400 KHz.

Bit 4 (OSC): Oscillator type selection

0: RC type

1: XTAL type (XTAL1 and XTAL2)

Bit 3 (HLP):

Power selection

0: Low power

1: High power

Bit 2 ~ Bit 0 (PR2 ~ PR0): Protect bits

PR2 ~ PR0 are protect bits that can be set as follows:

PR2

PR1

PR0

Protect

Enable

Disable

4.8.2 Customer ID Register (Word 1)

Bit 12 ~ Bit 0

XXXXXXXXXXXXX

Bit 12 ~ Bit 0: Customer’s ID code

EM78P157NAAS Datasheet(PDF) 33 Page - ELAN Microelectronics Corp