CHAPTER 11 SERIAL INTERFACE FUNCTION
User’s Manual U15109EJ3V0UD
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(3) Clocked serial interface receive buffer registers 5, 6 (SIRB5, SIRB6)
The SIRBn register is a 16-bit buffer register that stores receive data.
When the receive-only mode is set (TRMDn bit of CSIMn register = 0), reception is started by reading data
from the SIRBn register (n = 5, 6).
SIRBn 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: FFFFF244H, FFFFF264H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SIRBn
SIRB
n15
SIRB
n14
SIRB
n13
SIRB
n12
SIRB
n11
SIRB
n10
SIRB
n9
SIRB
n8
SIRB
n7
SIRB
n6
SIRB
n5
SIRB
n4
SIRB
n3
SIRB
n2
SIRB
n1
SIRB
n0
(n = 5, 6)
Cautions 1. Read the SIRBn register only when a data length of 16 bits has been set (CCLn bit of
CSIMn register = 1).
2. When the single transfer mode has been set (AUTOn bit of CSIMn register = 0), perform
a read operation only in the idle state (CSOTn bit of CSIMn register = 0). If the SIRBn
register is read during data transfer, the data cannot be guaranteed.
(4) Clocked serial interface receive buffer registers L5, L6 (SIRBL5, SIRBL6)
The SIRBLn register is an 8-bit buffer register that stores receive data.
When the receive-only mode is set (TRMDn bit of CSIMn register = 0), reception is started by reading data
from the SIRBLn register.
SIRBLn is set by an 8-bit memory manipulation instruction (n = 5, 6).
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 SIRBLn register is the same as the lower bytes of the SIRBn register.
After reset:
00H
R
Address: FFFFF246H, FFFFF266H
7
6
5
4
3
2
1
0
SIRBLn
SIRBn7
SIRBn6
SIRBn5
SIRBn4
SIRBn3
SIRBn2
SIRBn1
SIRBn0
(n = 5, 6)
Cautions 1. Read the SIRBLn register only when a data length of 8 bits has been set (CCLn bit of
CSIMn register = 0).
2. When the single transfer mode is set (AUTOn bit of CSIMn register = 0), perform a read
operation only in the idle state (CSOTn bit of CSIMn register = 0). If the SIRBLn register
is read during data transfer, the data cannot be guaranteed.