EM78468AQ EMC [ELAN Microelectronics Corp], EM78468AQ Datasheet - Page 56

• Manufacturer Part Number: EM78468AQ
• Description: 8-BIT Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78468
8-BIT Microcontroller
52 •
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)
Bit12~10 Bit9
• Bit 12 ~ 10: Not used.
These bits are set to “1” all the time.
• Bit 9 (CYES): Cycle select for JMP and CALL instructions
• Bit 8 (HLFS): main or sub-oscillator select
• Bit 7(ENWDTB): Watchdog timer enable/disable bit.
• Bit 6 (FSMD): sub-oscillator type selection.
• Bit 5, 4 (FMMD1, 0): main Oscillator type selection.
• 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.
• Bit 2~0 :
These bits are set to “0” all the time.
FSMD
1
0
0
0
1
1
1
CYES = “0”: only one instruction cycle (JMP or CALL) can be executed
CYES = “1”: two instructions cycles (JMP and CALL) can be executed
HLFS = “0”: CPU is set to select sub-oscillator when reset occurs.
HLFS = “1”: CPU is set to select main-oscillator when reset occurs.
ENWDTB = “0”: Enable watchdog timer.
ENWDTB = “1”: Disable watchdog timer.
HLP = “0”: Low power consumption mode
HLP = “1”: High power consumption mode
CYES HLFS ENWDTB FSMD FMMD1 FMMD0 HLP
FMMD1
0
0
1
0
0
1
Bit8
FMMD0
X
X
0
1
0
1
Bit7
Main Oscillator Type
(This specification is subject to change without further notice)
Bit6
Word 0
RC type
XTAL type
PLL type
RC type
XTAL type
PLL type
Bit5
Product Specification (V1.1) 04.11.2005
Bit4
Sub Oscillator Type
Bit3 Bit2 Bit1 Bit0
RC type
RC type
RC type
XTAL type
XTAL type
XTAL type
0
0
0