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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(3)
Clocked serial interface reception buffer registers (SIRB0 to SIRB2)
The SIRBn register is a 16-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 SIRBn register.
These registers are read-only, in 16-bit units.
In addition to reset input, these registers can also be initialized by clearing (0) the CSIE bit of the
CSIMn register.
Figure 13-24:
Clocked Serial Interface Reception Buffer Registers (SIRB0 to SIRB2)
Cautions: 1. Read the SIRBn register only when the 16-bit data length has been set (CCL bit of
CSIMn register = 1).
2. When the single transfer mode has been set (AUTO bit of CSIMn register = 0),
perform read operation only in the idle state (CSOT bit of CSIMn register = 0). If
the SIRBn register is read during data transfer, the data cannot be guaranteed.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Initial
value
SIRB0 SIRB15 SIRB14 SIRB13 SIRB12 SIRB11 SIRB10 SIRB9 SIRB8 SIRB7 SIRB6 SIRB5 SIRB4 SIRB3 SIRB2 SIRB1 SIRB0 FFFF FD02H 0000H
SIRB1 SIRB15 SIRB14 SIRB13 SIRB12 SIRB11 SIRB10 SIRB9 SIRB8 SIRB7 SIRB6 SIRB5 SIRB4 SIRB3 SIRB2 SIRB1 SIRB0 FFFF FD42H 0000H
SIRB2 SIRB15 SIRB14 SIRB13 SIRB12 SIRB11 SIRB10 SIRB9 SIRB8 SIRB7 SIRB6 SIRB5 SIRB4 SIRB3 SIRB2 SIRB1 SIRB0 FFFF FD82H 0000H
Bit Position
Bit Name
Function
15 to 0
SIRB15 to
SIRB0
Store receive data.
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