Mitsubishi DS907x SIP User Manual page 44

USER'S GUIDE
Read Access:
Write Access:
RPCTL.1
Initialization:
Read Access:
Write Access:
RPCTL.0
Initialization:
Read Access:
Write Access:
DS5001/DS5002 RPC STATUS REGISTER
Label: RPS
ST7 ST6
Bit Description:
RPS.7–4:
Initialization:
Read Access:
Write Access:
RPS.3:
Initialization:
Read Access:
Write Access:
RPS.2:
Initialization:
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Can be read anytime.
Can be written when the RPC mode is enabled (RPCON=1).
RPCON
Enable the RPC 8042 I/O protocol. When set, port 0 becomes the data bus,
and port 2 becomes the control signals.
Cleared on all resets.
Can be read at any time.
Can be written at any time.
RG0
This is a Range bit which is used to determine the size of the program
memory space. Its usage is shown above.
Unaffected by watchdog, external, or power–up resets. Cleared on a No V
reset or clearing of the security lock.
Can be read at any time.
Cannot be modified by the application software. Can only be modified via
the Bootstrap loader.
ST5 ST4
General purpose status bits that can be written by the microcontroller and
can be read by the external host.
Cleared when RPCON=0.
Can be read by DS5001/DS5002 and host CPU when RPC mode is invoked.
Can be written by the DS5001/DS5002 when RPC mode is invoked.
IA0
Stores the value of the external system A0 for the last DBBIN Write when
a valid write occurs (as determined by the IBF flag).
Cleared when RPC=0.
Can be read by DS5001/DS5002 and host CPU when in RPC mode.
Automatically written when a valid DBBIN Write occurs. Cannot be written
otherwise.
F0
General purpose flag written by the DS5001/DS5002 and read by the
external host.
Cleared when RPC=0.
Register Address: 0DAH
IA0 F0
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IBF OBF