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Type
Symbol
Operating mode
MD2 to MD0
control
RES
System control
MRES
STBY
BREQ
BREQO
BACK
FWE
I/O
Name and Function
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 H8S/2633 Series is
operating.
MD2
0
1
Input
Reset input: When this pin is driven low, the chip is
reset.
Input
Manual reset: When this pin is driven low, a
transmission is made to manual reset mode.
Input
Standby: When this pin is driven low, a transition is
made to hardware standby mode.
Input
Bus request: Used by an external bus master to issue
a bus request to the H8S/2633 Series.
Output
Bus request output: The external bus request signal
used when an internal bus master accesses external
space in the external bus-released state.
Output
Bus request acknowledge: Indicates that the bus has
been released to an external bus master.
Input
Flash write enable: Pin for flash memory use (in
planning stage).
MD1
MD0
0
0
1
1
0
1
0
0
1
1
0
1
Operating Mode
—
—
—
—
Mode 4
Mode 5
Mode 6
Mode 7
15
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