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Chapter 16
Clocked Serial Interface B (CSIB)
User’s Manual U16580EE3V1UD00
(4)
CSIBn status register (CBnSTR)
The CBnSTR register is an 8-bit register that displays the CSIB status.
This register can be read or written in 8-bit or 1-bit units, but the CBnSTF flag is a read-only.
Reset input clears this register to 00H.
In addition to reset input, the CBnSTR register can be initialized by clearing (0) the CBnPWR bit of
the CBnCTL0 register.
Figure 16-8:
CSIBn Status Register (CBnSTR)
Note:
Not available on
μ
PD70F3447
Remark:
μ
PD70F3187:
n = 0, 1
μ
PD70F3447:
n = 0
After reset:
00H
R/W
Address:
CB0CTL0 FFFFFD03H,
CB1CTL0 FFFFFD23H
Note
7
6
5
4
3
2
1
0
CBnSTR
CBnTSF
0
0
0
0
0
0
CBnOVE
CBnTSF
CSIBn Operation Control
0
Idle status
1
Operating status
During transmission, this register is set (1) when data is prepared in the CBnTX register,
and during reception, it is set (1) when a dummy read of the CBnRX register is performed.
The clear timing is after the edge of the last clock.
CBnOVE
Overrun Error Flag
0
No overrun
1
Overrun
•
An overrun error occurs when the next reception starts without performing a CPU read
of the value of the CBnRX register upon completion of the receive operation.
In this case the CBnOVE flag displays the overrun error occurrence status, and a
reception error interrupt (INTCBnRE) is generated.
•
The CBnOVE flag is cleared by writing 0 to it. It cannot be set even by writing 1 to it.
Содержание V850E/PH2
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