MB90550A/550B Series
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PIN DESCRIPTION
Pin no.
QFP
82
83
77
52
LQFP
80
81
75
50
Pin name
X0
X1
RST
HST
Circuit type
A
A
B
C
Oscillation pin
Oscillation pin
Reset input pin
Hardware standby input pin
General-purpose I/O ports.
A pull-up resistor can be added (RD07 to RD00 = 1) by using
the pull-up resistor setting register (RDR0).
D07 to D00 = 1: Disabled when the port is set for output.
Serve as lower data I/O/lower address output (AD00 to AD07)
pins in the external bus mode.
General-purpose I/O ports.
A pull-up resistor can be added (RD17 to RD10 = 1) by using the
pull-up resistor setting register (RDR1).
D17 to D10 = 1: Disabled when the port is set for output.
Serve as upper data I/O/middle address output (AD08 to AD15)
pins in the 16-bit bus-width, external bus mode.
General-purpose I/O ports.
This function is enabled either in single-chip mode or with the
external address output control register set to “Port”.
External address bus A16 to A23 output pins.
This function is enabled in an external-bus enabled mode with
the external address output register set to “Address”.
General-purpose I/O port.
This function is enabled in single-chip mode.
Address latch enable output pin.
This function is enabled in an external-bus enabled mode.
General-purpose I/O port.
This function is enabled in single-chip mode.
Read strobe output pin for the data bus.
This function is enabled in an external-bus enabled mode.
General-purpose I/O port.
This function is enabled in single-chip mode.
Write strobe output pin for the lower eight bits of the data bus.
This function is enabled in an external-bus enabled mode.
General-purpose I/O port.
This function is enabled in single-chip mode.
Write strobe output pin for the upper eight bits of the data bus.
This function is enabled in an external-bus enabled mode.
(Continued)
Function
P00 to P07
85 to 92 83 to 90
AD00 to
AD07
D
(CMOS)
93 to
100
P10 to P17
91 to 98
AD08 to
AD15
P20 to P27
D
(CMOS)
1 to 8
99,100,
1 to 6
A16 to A23
E
(CMOS)
P30
9
7
ALE
P31
10
8
RD
P32
12
10
WRL
P33
13
11
WRH
E
(CMOS)
E
(CMOS)
E
(CMOS)
E
(CMOS)
DS07-13706-6E
7
FUJITSU [ FUJITSU COMPONENT LIMITED. ]
