CHAPTER 11 SERIAL INTERFACE FUNCTION
User’s Manual U15109EJ3V0UD
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(11) Serial I/O shift registers 5, 6 (SIO5, SIO6)
The SIOn register is a 16-bit shift register that converts parallel data into serial data.
Data is shifted in (received) or shifted out (transmitted) starting from MSB or LSB.
Transfer is not started even if the SIOn register is read (n = 5, 6).
SIOn is set by a 16-bit memory manipulation instruction.
RESET input sets these registers to 0000H.
In addition to RESET input, these registers can also be initialized by clearing (0) the CSIEn bit of the CSIMn
register.
After reset:
0000H
R
Address: FFFFF254H, FFFFF274H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SIOn
SIO
n15
SIO
n14
SIO
n13
SIO
n12
SIO
n11
SIO
n10
SIO
n9
SIO
n8
SIO
n7
SIO
n6
SIO
n5
SIO
n4
SIO
n3
SIO
n2
SIO
n1
SIO
n0
(n = 5, 6)
Caution
Access the SIOn register only when a data length of 16 bits has been set (CCLn bit of CSIMn
register = 1), and only in the idle state (CSOTn bit of CSIMn register = 0). If the SIOn register
is accessed during data transfer, the data cannot be guaranteed.
(12) Serial I/O shift registers L5, L6 (SIOL5, SIOL6)
The SIOLn register is an 8-bit shift register that converts parallel data into serial data.
Data is shifted in (received) or shifted out (transmitted) starting from MSB or LSB.
Transfer is not started even if the SIOLn register is read (n = 5, 6).
SIOLn is set by an 8-bit or 1-bit memory manipulation instruction.
RESET input sets these registers to 00H.
In addition to RESET input, these registers can also be initialized by clearing (0) the CSIEn bit of the CSIMn
register.
The SIOLn register is the same as the lower bytes of the SIOn register.
After reset:
00H
R
Address: FFFFF256H, FFFFF276H
7
6
5
4
3
2
1
0
SIOLn
SIOn7
SIOn6
SIOn5
SIOn4
SIOn3
SIOn2
SIOn1
SIOn0
(n = 5, 6)
Caution
Access the SIOLn register only when a data length of 8 bits has been set (CCLn bit of CSIMn
register = 0), and only in the idle state (CSOTn bit of CSIMn register = 0). If the SIOLn
register is accessed during data transfer, the data cannot be guaranteed.