EM78P468NBQ EMC [ELAN Microelectronics Corp], EM78P468NBQ Datasheet - Page 23

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

Product Specification (V1.2) 03.15.2005
(This specification is subject to change without further notice)
4.2 Sp
4.2.1
Regis
4.2.2
4.2.3
Bit
Bit 3(P8HS): Switch to high nibble I/O of PORT 8 or to LCD segmen
pins SEGxx/P8.x pins
Bit 2(P8LS): Switch to low nibble I/O of PORT 8 or to LCD segmen
SEGx
Bit 1(P
pins SEGxx/P7.x pins
B
SEGxx/P7.x pins
ecial Purpose Registers
it 0(P7LS): Switch to low nibbl I/O of PORT 7 or to CD segment output as share pi
IOC57
IOC67
Bit 7
Bit 7
ters
7~
Internal data transfer, or instruction operand holding
This is not an addressable register.
I
IOC5 = “1”: s
P8HS = “0”: select high nibble of PORT 8 as normal P8.4~P8.7
P8HS = “1”: select LCD SEGMENT output as SEG 28~SEG 31 output
P8LS
P8LS = ”1”: select LCD SEGMENT output as SEG 24~SEG 27 output
P7HS = “0”: select high nibble of PORT 7 as normal P7.4~P7
P7HS = “1”: select LCD SEGMENT output as
P7LS = ”0”: select low nibble of PORT 7 as no
P7LS = “1”: select LCD SEGMENT output as SEG 16~SE
x/P8.x pins
A (Accumulator)
OC5x = “0”: set the relative P5.x I/O pins a
IOC 0/P5CR (PORT
Control Register)
(Address: 05h, Bit 0 of R5 = “0”)
IO
(A
4(IOC57~54): PORT 5 I/O direction control register
7HS): Switch to high
of I
C60
ddr
x
5
= ”0
IOC56
IOC66
OC P
ess:
Bit 6
Bit 6
/P6C
”: sele
06h
age
R (
et
ct low nibble of PORT 8 as normal
the relat
IOC55
IOC65
PORT
Bit 5
, Bit
Bit 5
0 (IO
nibble I/O o
0 of
C5
ive
e
5
6
I/O an PORT
IOC54
I/O Co
IOC64
0 ~ IO
P5.x I/O in into h
Bit 4
Bit 4
R5 =
f PORT 7 or to LCD segment output as share
d
CF
ntr
“0
p
IOC63
P8HS
”)
Bit 3
Bit 3
0, Bit
ol Re
s output
SEG
7,
gis
rmal P7.0~P7.3
igh
0 o
L
8 for L D Segm nt
IOC62
P8LS
Bit 2
Bit 2
impeda
ter)
f R5
P8.0~P8.3
20~SEG 23 ou
= “
C
nc
G 19 output
8-BIT Microcontroller
e (input
IOC61
t output as share pins
P7HS
0”)
Bit 1
Bit 1
.7
t output as share
EM78P468N
tput
pi
e
n)
IOC60
P7LS
Bit 0
Bit 0
• 19
ns