NEC V850E/MA1 User Manual page 396

(3) Serial I/O shift registers 0 to 2 (SIO0 to SIO2)
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 CSICAEn bit of the CSIMn
register is cleared (0).
These registers are read-only in 8-bit units.
Caution SIOn can be accessed only when the system is in an idle state (CSOTn = 0 in the CSIMn
register).
7 6
SIO0 SIO07 SIO06
SIO1 SIO17 SIO16
SIO2 SIO27 SIO26
Bit position Bit name
7 to 0 SIOn7 to
SIOn0
(n = 0 to 2)
396
CHAPTER 11 SERIAL INTERFACE FUNCTION
5 4 3
SIO05 SIO04 SIO03
SIO15 SIO14 SIO13
SIO25 SIO24 SIO23
Serial I/O
Shifts data in (reception) or shifts data out (transmission) beginning at the MSB or
the LSB side.
User's Manual U14359EJ4V0UM
2 1 0
SIO02 SIO01 SIO00
SIO12 SIO11 SIO10
SIO22 SIO21 SIO20
Function
Address After reset
FFFFF902H 00H
FFFFF912H 00H
FFFFF922H 00H