MB89855R Datasheet, PDF (7/48 Pages) Fujitsu Component Limited. – 8-bit Proprietary Microcontroller

MB89850R Series
s PIN DESCRIPTION
Pin no.
SH-DIP^*1 QFP^*2
30
23
31
24
28
21
29
22
27
20
Pin name
X0
X1
MOD0
MOD1
RST
56 to 49 49 to 42 P00/AD0 to
P07/AD7
48 to 41 41 to 34 P10/A08 to
P17/A15
40
33
P20/BUFC
39
32
P21/HAK
38
31
P22/HRQ
37
30
P23/RDY
36
29
P24/CLK
35
28
P25/WR
34
27
P26/RD
33
26
P27/ALE
2
59
P30/SCK1
*1: DIP-64P-M01, DIP-64C-A06
*2: FPT-64P-M06, FPT-64C-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)
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