upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 439

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

(4)
Remark:
CBnSTR CBnTSF
Symbol
This bit is set when data is prepared in the CBnTX register for transmission. It is set when dummy data is read
from the CBnRX register for reception.
It is cleared when the edge of the last clock is completed.
• An overrun error occurs if the next reception is started without the CPU reading the value of the receive buffer
• The CBnOVE flag indicates occurrence of this overrun error.
• The OBnOVE flag is cleared when 0 is written to it. It is not set when 1 is written to it.
CBnOVE
CBnTSF
during reception or on completion of a reception operation.
CSIBn status register (CBnSTR)
This is an 8-bit register that indicates the status of CSIB.
Although this register can be read or written in 8-bit or 1-bit units, the CBnSTF flag is read-only.
Reset input clears this register to 00H.
Clearing the CBnPWR bit of the CBnCTL0 register to 0 also initializes this register.
0
1
0
1
n = 0, 1
7
Idle status
Operating status
No overrun
Overrun
Figure 13-5: CSIBn Status Register (CBnSTR) Format
Address: CB0STR: FFFFFD03H, CB1STR: FFFFFD13H
6
0
Chapter 13 3-Wire Serial Interface (CSIB)
User’s Manual U16702EE3V2UD00
5
0
4
0
Transfer operation status flag
Overrun error flag
3
0
2
0
1
0
CBnOVE
0
R/W After Reset
R/W
00H
439