
11
MB90230 Series
(Continued)
*1: Enabled in any standby mode
*2: Enabled only in the hardware standby mode
Pin no.
Pin name
Circuit
type
H
Function
70
P50
This pin is enabled in the single-chip mode and when the CLK output
is disabled.
CLK output pin
This pin is enabled in an external-bus enabled mode with the CLK
output enabled.
General-purpose I/O port
This port is enabled in the single-chip mode.
Ready signal input pin
This pin is enabled in an external-bus enabled mode.
General-purpose I/O port
This port is enabled in the single-chip mode or when the hold function
is disabled.
Hold acknowledge signal output pin
This pin is enabled in the single-chip mode or when the hold function
is enabled.
General-purpose I/O port
This port is enabled in the single-chip mode or when the hold function
is disabled.
Hold acknowledge signal output pin
This pin is enabled in the single-chip mode or when the hold function
is enabled.
General-purpose I/O port
This port is enabled in the single-chip mode, in external-bus 8-bit
mode, or when the WR pin output is disabled.
Write strobe output pin for the upper eight bits of the data bus
This pin is enabled in an external-bus enabled mode and in external
bus 16-bit mode with the WR pin output enabled.
Reset signal input pin
This port is enabled in the single-chip mode, in external-bus 8-bit
mode, or when the WR pin output is disabled
Write strobe output pin for the lower eight bits of the data bus
This pin is enabled in an external-bus enabled mode and in external
bus 16-bit mode with the WR pin output enabled.
The pin is a general-purpose I/O port.
This pin is enabled in the single-chip mode.
Read strobe output pin for the data bus
This pin is enabled in an external-bus enabled mode.
General-purpose I/O port
Power pin (GND)
CLK
71
P51
F
RDY
72
P52
E
HAK
73
P53
E
HRQ
74
P54
E
WRH
75
76
RST
P55
B
E
WRL
77
P56
RD
E
78
79
P57
V
SS
E
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