21
Pin No.
Type
Symbol
FP-144
I/O
Name and Function
Operating mode
control
MD2 to MD0
1, 144, 143
Input
Mode pins: These pins set the
operating mode. The relation between
the settings of pins MD2 to MD0 and the
operating mode is shown below. These
pins should not be changed while the
MCU is operating.
MD0
MD1
MD0
Operating Mode
0
0
0
—
1
Mode 1
1
0
Mode 2
1
—
1
0
0
Mode 4
1
Mode 5
1
0
Mode 6
1
Mode 7
System control
RES
93
Input
Reset input: When this pin is driven
low, the chip is reset.
STBY
100
Input
Standby: When this pin is driven low, a
transition is made to hardware standby
mode.
BREQ
115
Input
Bus request: Requests chip to release
the bus to an external bus master.
BREQO
113
Output
Bus request output: External bus
request signal used when an internal
bus master accesses external space
when the external bus is released.
BACK
114
Output
Bus request acknowledge: Indicates
that the bus has been released to an
external bus master.
FWE
*
62
Input
Flash write enable: Enables/disables
flash memory.
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