參數(shù)資料
型號(hào): ST7267C8T1/XXX
廠商: STMICROELECTRONICS
元件分類(lèi): 微控制器/微處理器
英文描述: 16-BIT, MROM, 30 MHz, RISC MICROCONTROLLER, PQFP48
封裝: 7 X 7 MM, LEAD FREE, TQFP-48
文件頁(yè)數(shù): 54/189頁(yè)
文件大?。?/td> 1643K
代理商: ST7267C8T1/XXX
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ST7267C8 ST7267R8
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MSCI PARALLEL INTERFACE (Cont’d)
17.5 CASE OF NON CONTINUOUS DATA FLOW
17.5.1 Double buffer underflow in output mode
If the MSCI software is not able to send data fast
enough to the FIFO while the MSCI parallel inter-
face still has to send data, the communication
stops until FIFO is filled again and copied into the
communication buffer.
The control signal is forced to the CLDV state and
no data is driven on the port by the parallel inter-
face (data I/O state is controlled by the MSCI I/O
Controller when communication is frozen).
17.5.2 Double buffer overflow in input mode
If the MSCI software is not able to read data fast
enough from the FIFO while the MSCI parallel in-
terface still has to store data, the communication
stops until a communication buffer is free again.
If the option ROE=1 is selected, the control signal
is forced to the CLDV state and no data is driven
on the port by the parallel interface (data I/O state
depends on the MSCI I/O Controller).
If the option ROE=0, the last value of the control
signal is kept on the port until a buffer is available.
(last data is read at the end of the stretched cycle)
In both cases, no additional pulse is generated.
Figure 63. Example: output mode with CP=1 CLDV=1 F=010; CSS=010
Figure 64. Examples: input mode with CP=1 CLDV=0 F=010; CSS=010
Data output
data ports controlled
Control Signal
D12
D13
D14
D15
D17
D18
D19
D16
double buffer not empty
double buffer empty
double buffer not empty
depends on MSCI I/O Controller register values
data port driven by parallel interface
data port driven by
port still driven by parallel interface for one 60 MHz period
by MSCI I/O Controller
parallel interface
Control Signal
double buffer not full
double buffer full
double buffer not full
ROE=0
ROE=1
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