Sharp PC-E220 - Page 3

-3-
XIN i nput is enable when XIN control port is at
"1:
MSB
• When the set power source is turned on and
when the reset key is pressed, a high pulse is
supplied to IORESET.
1 High
I OR IORESET
0 Low
I I I I I I I ' OR I x I
·o· must be written i nto this bit. ---~f
MSB
SLOT =O: CERAM1 is effective.
SLOT= 1 : CERAM2 is effective.
By driving BK'2 to "1 , " the system ROM 8000H
- BFFFH is separated.
EXBANK3
0 EXBANK2
1 1
1 EXBANK1 1 0
0 EXBANKO
1 0
BK' O SOOOH - BFFFH
bank specification
BK' 2 BK' 1
• Supplied to BNK2, BNK1 , and BNKO pins
when making access to BK ' 2=BK'O (expan-
sion back port) 8000H - BFFFH.
8ANK3
ON Break key input
11 pi n in t erface
i nput port (181 and
182 are equipped
with pull down
r esistor . )
Expansion
peripheral RESET
Chip enable signal
supplied when
making access to
OOOOH - 7FFFH
( Active high)
CEROM2 signal is
supplied. (Active
Low)
81<'2
BNK2
1FH x
0
LSB
BANK2 0
BK'1 BNK1
1CH
0
x
L.S8
BANK1
0
OUT
BK'O BNKO
1 BH
0 0
specification
BK1 BKO
COOOH - FFFFH bank
OUT
I nput
pin
Output
pin
When making
access to 8000H ...;
BFFFH
CEROM1 s i gnal is
supplied (Active
l ow)
(
19H 0 0
0
0 0 17H
0 0
• Supplied t o BNKO and BNK1 pins when
making access to BKO, BK1 system ROM
bank port COOOH - FFFH.
O : Low output
1 : High output
O : I nterruption inhibit
1 • Interruption enable
OUT
OUTF01, F02
(Pch open drain)
BNKO BKO
BNK1 BK1
Output Input
p i n pin
When making
access to COOOH -
FFFFH
11 pin interface
output control port
Performs interrupt
enable/inhibit of
each interrupt
factor.
(
KON
181, 1 82
XIN
I ORESET
CERAM1
CERAM2
BNKO
BNK1
BNK2
F01, F02, XOUT
I nterrupt mask
READ WRITE ADDRESS
Pin funct i on
18H
0
Bit map
IN
Function
Name
-
PC.!.E220