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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(4)
Clocked serial interface reception buffer registers Low (SIRBL0 to SIRBL2)
The SIRBLn register is an 8-bit buffer register that stores receive data (n = 0 to 2).
When the receive-only mode is set (TRMD 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 units.
In addition to reset input, these registers can also be initialized by clearing (0) the CSIE bit of the
CSIMn register.
The SIRBLn register is the same as the lower bytes of the SIRBn register.
Figure 13-25:
Clocked Serial Interface Reception Buffer Registers Low (SIRBL0 to SIRBL2)
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 (CSOT bit of CSIMn register = 0). If the
SIRBLn register is read during data transfer, the data cannot be guaranteed.
7
6
5
4
3
2
1
0
Address
Initial
value
SIRBL0
SIRB7
SIRB6
SIRB5
SIRB4
SIRB3
SIRB2
SIRB1
SIRB0
FFFF FD02H
00H
SIRBL1
SIRB7
SIRB6
SIRB5
SIRB4
SIRB3
SIRB2
SIRB1
SIRB0
FFFF FD42H
00H
SIRBL2
SIRB7
SIRB6
SIRB5
SIRB4
SIRB3
SIRB2
SIRB1
SIRB0
FFFF FD82H
00H
Bit Position
Bit Name
Function
7 to 0
SIRB7 to
SIRB0
Stores receive data.
Summary of Contents for mPD703128
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