CHAPTER 12 SERIAL INTERFACE FUNCTION
Preliminary User’s Manual U15905EJ1V0UD
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).
SIOn7
SIOn
SIOn6
SIOn5
SIOn4
SIOn3
SIOn2
SIOn1
SIOn0
After reset:
00H R
Address:
SIO0: FFFFFD02H, SIO1: FFFFFD12H, SIO2: FFFFFD22H
SIO3: FFFFFD32H, SIO4
Note
: FFFFFD42H
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).
SIOEn7
SIOEn
SIOEn6
SIOEn5
SIOEn4
SIOEn3
SIOEn2
SIOEn1
SIOEn0
After reset:
00H R
Address:
SIOE0: FFFFFD03H, SIOE1: FFFFFD13H, SIOE2: FFFFFD23H
SIOE3: FFFFFD33H, SIOE4
Note
: FFFFFD43H
Note
SIOE4: V850ES/SA3 only
Remark
n = 0 to 3 (V850ES/SA2)
n = 0 to 4 (V850ES/SA3)
Содержание V850ES/SA2 UPD703201
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