EM78468 datasheet(56/71 Pages) EMC

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EM78468

8-BIT Microcontroller

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Product Specification (V1.1) 04.11.2005

(This specification is subject to change without further notice)

4.11 Code Options

The EM78468 has one Code Option word that is not a part of the normal program

memory.

Code Option Register (Word 0)

Word 0

Bit12~10 Bit9

Bit8

Bit7

Bit6

Bit5

Bit4

Bit3 Bit2 Bit1 Bit0

CYES HLFS ENWDTB FSMD FMMD1 FMMD0 HLP

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Bit 12 ~ 10: Not used.

These bits are set to “1” all the time.

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Bit 9 (CYES): Cycle select for JMP and CALL instructions

CYES = “0”: only one instruction cycle (JMP or CALL) can be executed

CYES = “1”: two instructions cycles (JMP and CALL) can be executed

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Bit 8 (HLFS): main or sub-oscillator select

HLFS = “0”: CPU is set to select sub-oscillator when reset occurs.

HLFS = “1”: CPU is set to select main-oscillator when reset occurs.

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Bit 7(ENWDTB): Watchdog timer enable/disable bit.

ENWDTB = “0”: Enable watchdog timer.

ENWDTB = “1”: Disable watchdog timer.

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Bit 6 (FSMD): sub-oscillator type selection.

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Bit 5, 4 (FMMD1, 0): main Oscillator type selection.

FSMD

FMMD1

FMMD0

Main Oscillator Type

Sub Oscillator Type

RC type

XTAL type

RC type

PLL type

RC type

XTAL type

PLL type

XTAL type

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Bit 3 (HLP): Power consumption selection. If your system usually runs in green mode, it

must be set to low power consumption to help support the energy saving issue. We

recommend that low power consumption mode is slected.

HLP = “0”: Low power consumption mode

HLP = “1”: High power consumption mode

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Bit 2~0 :

These bits are set to “0” all the time.

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