NEC V850ES/SA2 UPD703201 Manual page 336

(3) Serial I/O shift register n (SIOn)
The SIOn register is an 8-bit shift register that converts parallel data to serial data. If TRMDn = 0 in the CSIMn
register, the transfer is started by reading SIOn.
Except when a reset is input, the SIOn register becomes 00H even when the CSIEn bit of the CSIMn register
is cleared (0).
SIOn shifts data in (reception) or shifts data out (transmission) beginning at the MSB or the LSB side.
This register is read-only, in 8-bit units.
Caution The SIOn register can be accessed only when the system is in an idle state (CSOTn bit = 0
in the CSIMn register).
After reset: 00H
SIOn SIOn7
Note SIO4: V850ES/SA3 only
Remark n = 0 to 3 (V850ES/SA2)
n = 0 to 4 (V850ES/SA3)
(4) Receive-only serial I/O shift register n (SIOEn)
The SIOEn register is an 8-bit shift register that converts parallel data into serial data. A receive operation
does not start even if the SIOEn register is read while the TRMDn bit of the CSIMn register is 0. Therefore this
register is used to read the value of the SIOn register (receive data) without starting a receive operation.
SIOEn shifts data in (reception) beginning at the MSB or the LSB side.
Except when a reset is input, the SIOEn register becomes 00H even when the CSIEn bit of the CSIMn register
is cleared (0).
This register is read-only, in 8-bit units.
Caution The SIOEn register can be accessed only when the system is in an idle state (CSOTn bit = 0
in the CSIMn register).
After reset: 00H
SIOEn SIOEn7
Note SIOE4: V850ES/SA3 only
Remark n = 0 to 3 (V850ES/SA2)
n = 0 to 4 (V850ES/SA3)
336
CHAPTER 12 SERIAL INTERFACE FUNCTION
R Address: SIO0: FFFFFD02H, SIO1: FFFFFD12H, SIO2: FFFFFD22H
SIO3: FFFFFD32H, SIO4
SIOn6 SIOn5 SIOn4
R Address: SIOE0: FFFFFD03H, SIOE1: FFFFFD13H, SIOE2: FFFFFD23H
SIOE3: FFFFFD33H, SIOE4
SIOEn6 SIOEn5 SIOEn4
Preliminary User's Manual U15905EJ1V0UD
Note
: FFFFFD42H
SIOn3 SIOn2 SIOn1
Note
: FFFFFD43H
SIOEn3 SIOEn2 SIOEn1
SIOn0
SIOEn0