MB89T857P-SH 데이터 시트보기 (PDF) - Fujitsu
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MB89T857P-SH Datasheet PDF : 51 Pages
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MB89860/850 Series
s PIN DESCRIPTION
Pin no.
SH-DIP*1 QFP*2
30
13
31
14
28
11
29
12
27
16
Pin name
X0
X1
MOD0
MOD1
RST
56 to 49 40 to 33 P00 /AD0 to
P07/AD7
48 to 41 32 to 25 P10 /A08 to
P17/A15
40
24
P20/BUFC
39
23
P21/HAK
38
22
P22/HRQ
37
21
P23/RDY
36
20
P24/CLK
35
19
P25/WR
34
18
P26/RD
33
17
P27/ALE
2
48
P30/SCK1
*1: DIP-64P-M01, DIP-64C-A06
*2: FPT-80P-M06, FPT-80C-A02
Circuit
type
Function
A
Crystal oscillator pins (10 MHz)
B
Operating mode selection pins
Connect directly to VCC or VSS.
C
Reset I/O pin
This pin is an N-ch open-drain output type with a pull-up
resistor, and a hysteresis input type. “L” is output from this
pin by an internal reset source. The internal circuit is
initialized by the input of “L”.
D
General-purpose I/O ports
When an external bus is used, these ports function as
multiplex pins of lower address output and data I/O.
D
General-purpose I/O ports
When an external bus is used, these ports function as
upper address output.
F
General-purpose output port
When an external bus is used, this port can also be used
as a buffer control output.
F
General-purpose output port
When an external bus is used, this port can also be used
as a hold acknowledge output.
D
General-purpose output port
When an external bus is used, this port can also be used
as a hold request input.
D
General-purpose output port
When an external bus is used, this port functions as a
ready input.
F
General-purpose output port
When an external bus is used, this port functions as a
clock output.
F
General-purpose output port
When an external bus is used, this port functions as a
write signal output.
F
General-purpose output port
When an external bus is used, this port functions as a
read signal output.
F
General-purpose output port
When an external bus is used, this port functions as an
address latch signal output.
E
General-purpose I/O port
Also serves as the clock I/O for the UART.
This port is a hysteresis input type.
(Continued)
7
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