EM78P468NBQ EMC [ELAN Microelectronics Corp], EM78P468NBQ Datasheet - Page 16

• Manufacturer Part Number: EM78P468NBQ
• Description: 8-BIT Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78P468N
8-BIT Microcontroller
12 •
4.1.4
4.1.5
Bit 7 :
Bit 6 ~ 5 (PS
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
does
wh
Bit
up and reset to 0 by WDT timeout.
WDT wake up from sleep mode
WD time out (not sleep mode)
/RESE
Po
Low pulse on /RESET
Bit 3 (P) : Power down bit. Set to 1 during power on or by a "WDTC" command and reset
Bit 2 (Z) : Zero flag
Bit 1 (
Bi
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.
t 0 (C)
RBS1
wer up
Bit 7
Bit 7
ere the
4 (T)
T
PS1
--
t PS1~PS0 bits to change ROM page. When executing a "JMP"
0
0
1
1
ctions which causes the program counter to be changed (e
not change the PS0~PS1 bits.
R3/SR (Status Register)
(Address: 03h)
R4/RSR (RAM Select Register)
(Address: 04h)
DC) : Auxiliary carry
T wake up from slee
Not used
: Tim
: Ca
to 0 by a "SLEP" command.
su
broutin
RBS0
1 ~ 0) :
Bit 6
rry flag
Bit 6
EVENT
PS1
e-out
PS0
0
1
0
1
e w
bit. S
Pa
as calle
RSR5
ge sele
Bit 5
Bit 5
PS0
et to
p
flag.
1 by
ct bits
d, r
Page 3 (C00H ~ FFFH)
Page 2 (800H ~ BFFH)
egardless of the cu
Page 0 (000H ~ 3FFH)
Page 1 (400H ~ 7FFH)
RSR4
ROM page (Address)
Bit 4
the "S
Bit 4
(This specification is subject to change without further notice)
T
That is, the return will always be to the page from
LEP
T
0
0
1
1
1
RSR3
" and
Bit 3
Bit 3
P
Product Specification (V1.2) 03.15.2005
"WD
rre
P
0
1
0
1
1
TC" co
RSR2
nt sett
Bit 2
Bit 2
RET (RETL, RETI) instruction
Z
X: don't care
ing o
mm
ands o
RSR1
Bit 1
Bit 1
f PS0
DC
REMARK
, "CALL", or other
.g. MOV R2, A),
~PS
r duri
1 bits.
RSR0
Bit 0
Bit 0
ng po
C
wer