CHAPTER 11 SERIAL INTERFACE FUNCTION
396
User’s Manual U14359EJ4V0UM
(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
5
4
3
2
1
0
Address
After reset
SIO0
SIO07
SIO06
SIO05
SIO04
SIO03
SIO02
SIO01
SIO00
FFFFF902H
00H
SIO1
SIO17
SIO16
SIO15
SIO14
SIO13
SIO12
SIO11
SIO10
FFFFF912H
00H
SIO2
SIO27
SIO26
SIO25
SIO24
SIO23
SIO22
SIO21
SIO20
FFFFF922H
00H
Bit position
Bit name
Function
7 to 0
SIOn7 to
SIOn0
(n = 0 to 2)
Serial I/O
Shifts data in (reception) or shifts data out (transmission) beginning at the MSB or
the LSB side.
Содержание V850E/MA1
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