EM78P468LAQ EMC [ELAN Microelectronics Corp], EM78P468LAQ Datasheet - Page 55

• Manufacturer Part Number: EM78P468LAQ
• Description: 8-BIT Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

Product Specification (V1.0) 03.15.2006
(This specification is subject to change without further notice)
4.11 Code Options
The EM78P468L has one Code Option word that is not a 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:
Word1 of code options is for customer ID code application.
Word 0 of Code Options is for IC function setting. The following are the settings for OTP
IC programming :
• 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.
Bit12~10
FSMD
1
0
0
0
1
1
1
Bit12~Bit 0
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.
Word 1
CYES HLFS ENWDTB FSMD FMMD1 FMMD0 HLP
FMMD1
Bit9
0
0
1
0
0
1
Bit8
FMMD0
X
X
0
1
0
1
Bit7
Main Oscillator Type
Bit6
Word 0
RC type
XTAL type
PLL type
RC type
XTAL type
PLL type
Bit5
Bit4
Bit3
Sub Oscillator Type
8-BIT Microcontroller
Bit2
PR2
RC type
RC type
RC type
XTAL type
XTAL type
XTAL type
EM78P468L
PR1
Bit1
PR0
Bit0
• 51