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| 型號(hào)： | EM78P468N |
| 廠商： | ELAN Microelctronics Corp . |
| 元件分類(lèi)： | 8位微控制器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁(yè)數(shù)： | 16/82頁(yè) |
| 文件大?。?/td> | 1491K |
| 代理商： | EM78P468N |
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EM78P468N
8-BIT Microcontroller
12
Product Specification (V1.2) 03.15.2005
(This specification is subject to change without further notice)
4.1.4
R3/SR (Status Register)
(Address: 03h)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
--
PS1
PS0
T
P
Z
DC
C
Bit 7 :
Bit 6 ~ 5 (PS
PS1
Pa
ct bits
Not used
1 ~ 0) :
ge sele
PS0
ROM page (Address)
0
0
Page 0 (000H ~ 3FFH)
0
1
Page 1 (400H ~ 7FFH)
1
0
Page 2 (800H ~ BFFH)
1
1
Page 3 (C00H ~ FFFH)
PS0~PS1 are used to select a ROM page. User can use PAGE instruction (e.g. PAGE 1)
or se
instru
PS0~PS1 are loaded into the 11th and 12th bits of the program counter where it selects
one of the available program memory pages. Note that
not change the PS0~PS1 bits.
ere the
broutin
as calle
egardless of the cu
, "CALL", or other
.g. MOV R2, A),
RET (RETL, RETI) instruction
does
wh
That is, the return will always be to the page from
rre
ing o
nt sett
su
e w
d, r
~PS
Bit
up and reset to 0 by WDT timeout.
EVENT
:
Tim
bit. S
1 by
LEP
"WD
mm
r duri
wer
t PS1~PS0 bits to change ROM page. When executing a "JMP"
ctions which causes the program counter to be changed (e
f PS0
1 bits.
4 (T)
e-out
et to
the "S
" and
TC" co
ands o
ng po
T
P
REMARK
WDT wake up from sleep mode
WD time out (not sleep mode)
T
/RESE
T wake up from slee
Po
wer up
Low pulse on /RESET
0
0
1
1
1
0
1
0
1
1
X: don't care
p
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 1 (
flag.
Bi
:
Ca
4.1.5
R4/RSR (RAM Select Register)
(Address: 04h)
Bit 7
Bit 6
Bit 5
Bit 2 (Z) :
Zero flag
DC) :
Auxiliary carry
t 0 (C)
rry flag
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RBS1
RBS0
RSR5
RSR4
RSR3
RSR2
RSR1
RSR0
Bits 7 ~ 6 (RBS1 ~ RBS0) :
determine which bank is activated among the 4 banks. See
the configuration of the data memory in Fig.4. Use BANK instruction (e.g. BABK 1) to
change bank.
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