Status Command Transfer Format; Status Command Status Format - NEC PD75402A User Manual

STATUS command
This command is used to read the status of the currently selected slave.
Remarks M : Output by master
S : Output by slave
The format of the status byte returned by the slave is shown below.
MSB
Status 7 6 5
All 0s
When the slave sends status data, it compares the SIO contents before and after transmission and
if they do not match an error is generated and no ACK is returned.
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
Fig. 5-57 STATUS Command Transfer Format
M S
ACK
STATUS
Command
Fig. 5-58 STATUS Command Status Format
LSB
4 3 2 1 0
S S
Status ACK
Data
Bit indicating possibility of data transmission
0 : No data for transmission
1 : 1 or more bytes of send data ready
Bit indicating possibility of data reception
0 : No receive data storage area
1 : 1 or more bytes of receive data storage area ready
Bit indicating error occurrence
0 : No error
1 : Error occurred in previous transfer
Bit indicatin possibility of change of master
0 : Chang of master not possible
1 : Change of mster possible
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