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型號：	UPD703270GF-XXX-JBT
元件分類：	微控制器/微處理器
英文描述：	32-BIT, MROM, 20 MHz, RISC MICROCONTROLLER, PQFP100
封裝：	14 X 20 MM, PLASTIC, QFP-100
文件頁數(shù)：	586/1080頁
文件大小：	6965K
代理商：	UPD703270GF-XXX-JBT

CHAPTER 16 3-WIRE VARIABLE-LENGTH SERIAL I/O (CSIB)

User’s Manual U16541EJ4V0UD

16.9 Cautions

When transferring transmit data and receive data using DMA transfer, error processing cannot be performed

even if an overrun error occurs during serial transfer. Check that the no overrun error has occurred by

reading the CBnSTR.CBnOVE bit after DMA transfer has been completed.

In regards to registers that are forbidden from being rewritten during operations (CBnCTL0.CBnPWR bit is 1),

if rewriting has been carried out by mistake during operations, set the CBnCTL0.CBnPWR bit to 0 once, then

initialize CSIBn.

Registers to which rewriting during operation are prohibited are shown below.

CBnCTL0 register: CBnTXE, CBnRXE, CBnDIR, CBnTMS bits

CBnCTL1 register: CBnCKP, CBnDAP, CBnCKS2 to CBnCKS0 bits

CBnCTL2 register: CBnCL3 to CBnCL0 bits

(3) In communication type 2 or 4 (CBnCTL1.CBnDAP bit = 1), the CBnSTR.CBnTSF bit is cleared half a SCKBn

clock after occurrence of a reception complete interrupt (INTCBnR).

In the single transfer mode, writing the next transmit data is ignored during communication (CBnTSF bit = 1),

and the next communication is not started. Also if reception-only communication (CBnCTL0.CBnTXE bit = 0,

CBnCTL0.CBnRXE bit = 1) is set, the next communication is not started even if the receive data is read during

communication (CBnTSF bit = 1).

Therefore, when using the single transfer mode with communication type 2 or 4 (CBnDAP bit = 1), pay

particular attention to the following.

To start the next transmission, confirm that CBnTSF bit = 0 and then write the transmit data to the CBnTX

To perform the next reception continuously when reception-only communication (CBnTXE bit = 0, CBnRXE

bit = 1) is set, confirm that CBnTSF bit = 0 and then read the CBnRX register.

Or, use the continuous transfer mode instead of the single transfer mode. Use of the continuous transfer mode

is recommended especially for using DMA.

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