CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U14492EJ3V0UD
491
(4) Clocked serial interface reception buffer registers L0, L1 (SIRBL0, SIRBL1)
The SIRBLn register is an 8-bit buffer register that stores receive data (n = 0, 1).
When the receive-only mode is set (TRMDn bit of CSIMn register = 0), the reception operation is started by
reading data from the SIRBLn register.
These registers are read-only in 8-bit or 1-bit units.
In addition to reset input, these registers can also be initialized by clearing (0) the CSICAEn bit of the CSIMn
register.
The SIRBLn register is the same as the lower bytes of the SIRBn register.
Cautions 1. Read the SIRBLn register only when the 8-bit data length has been set (CCL bit of
CSIMn register = 0).
2. When the single transfer mode is set (AUTO bit of CSIMn register = 0), perform 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.
7
SIRB7
SIRBL0
6
SIRB6
5
SIRB5
4
SIRB4
3
SIRB3
2
SIRB2
1
SIRB1
0
SIRB0
Address
FFFFF902H
Initial value
00H
7
SIRB7
SIRBL1
6
SIRB6
5
SIRB5
4
SIRB4
3
SIRB3
2
SIRB2
1
SIRB1
0
SIRB0
Address
FFFFF912H
Initial value
00H
Bit Position
Bit Name
Function
7 to 0
SIRB7 to
SIRB0
Stores receive data.