參數(shù)資料
型號: M34508G4GP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO20
封裝: 4.40 X 6.50 MM, 0.65 MM PITCH, PLASTIC, SSOP-20
文件頁數(shù): 50/106頁
文件大?。?/td> 1059K
代理商: M34508G4GP
Rev.1.03
2009.07.27
page 46 of 140
REJ03B0148-0103
4508 Group
M0–M7: Contents of master serial interface register
S0–S7: Contents of slave serial interface register
Rising of SCK: Serial input
Falling of SCK: Serial output
SIN
SOUT
Master
Slave
SCK
SST instruction
SOUT
SIN
S0
S7’S1
S2
S3
S4
S5
S6
S7
SST instruction
SRDY signal
S0
S7
S1
S3
S4
S5
S6
S7
M0
M7
M1
M2
M3
M4
M5
M6
M7
M0
M7’M1
M2
M3
M4
M5
M6
M7
S2
Fig. 39 Timing of serial interface data transfer
Table 16 Processing sequence of data transfer from master to slave
1-byte data is serially transferred on this process. Subsequently, data
can be transferred continuously by repeating the process from *.
When an external clock is selected as a synchronous clock, control
the clock externally because serial transfer is performed as long as
clock is externally input. (Unlike an internal clock, an external clock
is not stopped when serial transfer is completed.) However, the
Master (transmission)
[Initial setting]
Setting the serial interface control register J1 and inter-
rupt control register V2 shown in Figure 38.
TJ1A and TV2A instructions
Setting the port received the reception enable signal
(SRDY) to the input mode.
(Port D3 is used in this example)
SD instruction
* [Transmission enable state]
Storing transmission data to serial interface register SI.
TSIAB instruction
[Transmission]
Check port D3 is “L” level.
SZD instruction
Serial transfer starts.
SST instruction
Check transmission completes.
SNZSI instruction
Wait (timing when continuously transferring)
Slave (reception)
[Initial setting]
Setting serial interface control register J1, and interrupt control register V2
shown in Figure 38.
TJ1A and TV2A instructions
Setting the port transmitted the reception enable signal (SRDY) and output-
ting “H” level.
(Port D3 is used in this example)
SD instruction
*[Reception enable state]
The SIOF flag is cleared to “0.”
SST instruction
“L” level (reception possible) is output from port D3.
RD instruction
[Reception]
Check reception completes.
SNZSI instruction
“H” level is output from port D3.
SD instruction
[Data processing]
SIOF flag is set to “1” when the clock is counted 8 times after ex-
ecuting the SST instruction. Be sure to set the initial level of the
external clock to “H.”
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