EM78808
8-bit Micro-controller
User Application Note
1. ROM, OTP, ICE
ROM
OTP
ICE
EM78808
EM78P808
EM78808 ICE
2. The difference between EM78R808A , EM78P808 and EM78808 are listed in the table
EM78P808
VDD or 2V
O
EM78R808A
VDD
X
EM78808
VDD or 2V
X
Comparator reference voltage
Stack pointer
Data ROM max access frequency 10.74 MHz
10.74MHz
3.58 MHz
3.For accessing data ROM,EM78P808 (OTP) can work at 10.74MHz, but please note that
ROM type EM78808 only can work at 3.58MHz
4. While switching main clock (regardless of high freq to low freq or on the other hand),
adding 6 instructions delay (NOP) is required.
6. For DATA ROM or DATA RAM least address(A0~A7), when using “INC”
instruction and overflow occur, the middle address will auto_increase. If using “DEC”
instruction and least address from 0x00ꢀ0xFF, the middle address can’t
auto_decrease.
7. Please do not switch MCU operation mode from normal mode to idle or sleep mode
directly. Before into idle or sleep mode, please switch MCU to green mode.
8. Please always keep RA page0 bit7 = 0 or un-expect error will happen!!
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* This specification is subject to change without notice.
8/1/2004 (V3.1)
3
ELAN [ ELAN MICROELECTRONICS CORP ]
