EM785840 Ver la hoja de datos (PDF) - ELAN Microelectronics
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EM785840 Datasheet PDF : 45 Pages
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EM785840/5841/5842
8-bit Micro-controller
"MOV R2, A" allows the loading of an address from the A register to the PC, and the ninth and tenth bits are
cleared to "0''.
"ADD R2,A" allows a relative address be added to the current PC, and contents of the ninth and tenth bits are
cleared to "0''.
"TBL" allows a relative address added to the current PC, and contents of the ninth and tenth bits don't change.
The most significant bit (A10~A11) will be loaded with the contents of bit PS0~PS1 in the status register (R5
PAGE0) upon the execution of a "JMP'', "CALL'', "ADD R2, A'', or "MOV R2, A'' instruction.
If an interrupt is triggered, PROGRAM ROM will jump to address 0x08 at page0. The CPU will store ACC,
R3 status and R5 PAGE automatically, and they will be restored after instruction RETI.
R5(PAGE)
A11 A10
00
01
10
A9 A8 A7~A0
CALL
and
INTERRUPT
PAGE0 00000~003FF
PAGE1 00400~007FF
RET
RETL
RETI
PAGE2 00800~00BFF
STACK1
STACK2
STACK3
STACK4
STACK5
STACK6
STACK7
STACK8
store
ACC,R3,R5(PAGE)
restore
1 1 PAGE3 00C00~00FFF
Fig.3 Program counter organization
R3 (Status, Page selection)
(Status flag, Page selection bits)
7
6
5
4
3
2
1
0
RPAGE1 RPAGE0 IOCPAGE T
P
Z DC C
R/W-0 R/W-0 R/W-0
R
R R/W R/W R/W
Bit 0(C) : Carry flag
Bit 1(DC) : Auxiliary carry flag
Bit 2(Z) : Zero flag
Bit 3(P) : Power down bit
Set to 1 during power on or by a "WDTC" command and reset to 0 by a "SLEP" command.
Bit 4(T) : Time-out bit
Set to 1 by the "SLEP" and "WDTC" command, or during power up and reset to 0 by WDT timeout.
EVENT
T
P
REMARK
WDT wake up from sleep mode
0
0
WDT time out (not sleep mode)
0
1
/RESET wake up from sleep
1
0
Power up
1
1
Low pulse on /RESET
x
X
x : don't care
Bit 5(IOCPAGE) : change IOC5 ~ IOCE to another page
Please refer to Fig.4 control register configuration for details.
0/1 Î IOC page0 / IOC page1
__________________________________________________________________________________________________________________________________________________________________
* This specification is subject to change without notice.
8
2004/11/10 V1.2
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