NEC V850E/MA1 User Manual page 397

(4) Receive-only serial I/O shift registers 0 to 2 (SIOE0 to SIOE2)
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 TRMD 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.
Except when a reset is input, the SIOEn 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 SIOEn can be accessed only when the system is in an idle state (CSOTn = 0 in the CSIMn
register).
7 6
SIOE0 SIOE07 SIOE06
SIOE1 SIOE17 SIOE16
SIOE2 SIOE27 SIOE26
Bit position Bit name
7 to 0 SIOEn7 to
SIOEn0
(n = 0 to 2)
CHAPTER 11 SERIAL INTERFACE FUNCTION
5 4 3
SIOE05 SIOE04 SIOE03
SIOE15 SIOE14 SIOE13
SIOE25 SIOE24 SIOE23
Serial I/O
Shifts data in (reception) beginning at the MSB or the LSB side.
User's Manual U14359EJ4V0UM
2 1 0
SIOE02 SIOE01 SIOE00 FFFFF903H
SIOE12 SIOE11 SIOE10 FFFFF913H
SIOE22 SIOE21 SIOE20 FFFFF923H
Function
Address After reset
00H
00H
00H
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