EM78P915
8-bit Micro-controller
3. In the appendix, it provides all operational/special purpose registers, figures and tables list for user to search quickly.
4. While switching main clock (regardless of high freq to low freq or on the other hand), adding 6 instructions delay (NOP) is
required.
5. Please do not switch MCU operation mode from normal mode to sleep mode directly. Before into idle or sleep mode,
please switch MCU to green mode.
6. For 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 0x00 0xFF, the middle address can’t auto_decrease.
7. With increasing frequency of using interrupt, it may be occur interrupt flag loss. But it could be solved by our suggestion.
So for avoiding any instruction loss, please obey the following program way for now, of course, we already start to enable
our production procedure for reducing the possibility of loss.
Suggestion way,
Clear interrupt flag (RF): change
“BC”
to
“MOV”.
Example: clear bit0 of RF,
Before
Suggestion now
MOV a,@0xFE
BC 0x0f, 0x00
MOV 0x0f,a
8. In the application, some users need latch interrupt flag during disable interrupt mask register (IOCF), but some users don’t
need. In the application of EM78 series, we revise this status to latch. So, users must clear the latch interrupt flag before
enable interrupt mask register. The method how to use instruction is showed as follows,
Example:
IOR
IOCF
MOV RF,A
MOV A,@0x??
IOW IOCF
9. Code-option setting note: Un-used or empty bit of code-option can’t be changed to 0. So, please keep them in 1 to avoid
some un-prediction occur.
10. /POVD setting note: please confirm whether /POVD will be enable or disable before ordering EM78P915. If users still
couldn’t understand, users can get some information from our FAE or sales.
__________________________________________________________________________________________________________________________________________________________________
* This specification is subject to be changed without notice.
2005/12/21 (V2.0)
EMC [ ELAN MICROELECTRONICS CORP ]
