EM78P311SXSSLASHXJ datasheet(57/68 Pages) EMC

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EM78P311N

8-Bit Microcontroller

Product Specification (V1.0) 10.02.2006

• 53

(This specification is subject to change without further notice)

Table13. RC Oscillator Frequencies

Cext

Rext

Average Fosc 5V, 25

°C Average Fosc 3V, 25°C

3.3k

4.32 MHz

3.56 MHz

5.1k

2.83 MHz

2.8 MHz

10k

1.62 MHz

1.57 MHz

20 pF

100k

184kHz

187kHz

3.3k

1.39 MHz

1.35 MHz

5.1k

950kHz

930kHz

10k

500kHz

490kHz

100 pF

100k

54kHz

55kHz

3.3k

580kHz

550kHz

5.1k

390kHz

380kHz

10k

200kHz

300 pF

100k

21kHz

Note:

1: Measured based on DIP packages.

2: The values are for design reference only.

5.17 Code Option Register

The EM78P311N has one CODE option word that is not part of the normal program

memory. The option bits cannot be accessed during normal program execution.

Code Option Register and Customer ID Register arrangement distribution:

Word 0

Word 1

Word 2

Bit 12~Bit 0

5.17.1 Code Option Register (Word 0)

Word 0

Bit 12 ~ 9

Bit 8

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CLKS

ENWDTB

CYES

OSC

HLP

PR2

PR1

PR0

Bit 12 ~ 9 :

Not used

Bit 8 (CLKS) :

Instruction period option bit

CLKS = “0” :

two oscillator periods

CLKS = “1” :

four oscillator periods.

Refer to the Instruction Set section.

Bit 7 (ENWDTB) :

Watchdog timer enable bit

ENWDTB = “0” :

Enable

ENWDTB = “1” :

Disable

Bit 6 (CYES) :

Cycle selection for JMP, CALL instruction

CYES = “0” :

One cycle

CYES = “1” :

Two cycles

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