NEC V850ES/KE1+ User Manual page 444

Register R/W
Name
SIRBn Read Function Storing received data
(SIRBnL)
Use method When transmission and reception are
complete, read the received data from
this register.
SIRBEn Read Function
(SIRBEnL)
Use method Not used.
SIO0n Read Function
(SIO0nL)
Use method Not used.
• Starting transmission/reception when
SOTBn Write Function
(SOTBnL) written
• Storing the data to be transmitted
Use method When transmission/reception is
complete, write the data to be
transmitted next.
SOTBFn Write Function
(SOTBFnL)
Use method Not used
Notes 1. It is assumed that the number of data to be transmitted is N.
2. Neither reading nor writing will start communication.
Remark In the 16-bit mode, the registers not enclosed in parentheses are used; in the 8-bit mode, the registers in parentheses are used.
Table 15-1. Use of Each Buffer Register
Single Transfer
Transmission/Reception Mode
• Reading starts reception
Note 2
• Storing received data
• First, read dummy data and start
transfer.
• To perform reception of the next data
after reception is complete, read the
received data from this register.
−
Storing the data received last
If reception of the next data will not be
performed after reception is complete,
read the received data from this register.
−
Not used
Not used
−
Not used
Receive-Only Mode Transmission/Reception Mode
Storing up to the (N − 1)th received data
(other than the last)
When reception is complete, read the
received data from this register. Repeat
this operation until the (N − 1)th data has
been received.
Note 2
Not used
−
Storing the Nth (last) received data
When the Nth (last)
transmission/reception is complete, read
the Nth (last) data.
− • Starting transmission/reception when
written
• Storing the data to be transmitted
second and subsequently
When transmission/reception is
complete, write the data to be
transmitted next to this register to start
the next transmission/reception.
−
Storing the data to be transmitted first
Before starting transmission/reception
(writing to SOTBn), write the data to be
transmitted first.
Note 1
Continuous Transfer
Receive-Only Mode
• Reading starts reception
• Storing up to the (N − 2)th data (other
Note 2
than the last two)
When reception is complete, read the
received data from this register. Repeat
this operation until the (N − 2)th data has
been received.
(Supplement)
Do not read the (N − 1)th data from this
register. If read, a reception operation
starts and continuous transfer cannot be
completed.
− Storing the (N − 1)th received data
Read the (N − 1)th received data from
this register when the (N − 1)th or Nth
(last) data has been received.
Note 2
Storing the Nth (last) received data
When the Nth (last) data has been
received, read the Nth (last) data.
−
Not used
−
Note 2
Not used
Note 2
Note 2