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参数资料
型号： M37641F8FP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP80
封装： 14 X 20 MM, 0.80 MM, PLASTIC, QFP-80
文件页数： 67/140页
文件大小： 1694K
代理商： M37641F8FP
7641 Group
Rev.4.00
Aug 28, 2006
page 30 of 135
REJ03B0191-0400
qSerial I/O Normal Operation
The serial I/O counter is set to “7” by writing operation to the serial
I/O shift register (address 002A16). When the SRDY Output Select
bit is “1”, the SRDY pin goes “L” after that writing. On the negative
edge of the transfer clock the SRDY pin returns “H” and the data
of the first bit is transmitted from the STXD pin. The remaining
data are done from the STXD pin bit by bit on each falling edge of
the transfer clock.
Additionally, the data is latched from the SRXD pin on each rising
edge of the transfer clock and then the contents of the serial I/O
shift register are shifted by one bit.
When the internal system clock is selected as the transfer clock,
the followings occur at counting eight transfer clocks:
The serial I/O counter reaches “0”
The transfer clock halts at “H”
The serial I/O interrupt request bit is set to “1”
The STXD pin goes a high-impedance state after an 8-bit transfer
is completed.
When the external clock is selected as the transfer clock, the fol-
lowings occur at counting eight transfer clocks:
The serial I/O counter reaches “0”
The serial I/O interrupt request bit is set to “1”
In this case, the transfer clock needs to be controlled by the exter-
nal source because the transfer clock does not halt. Additionally,
the STXD pin does not go a high-impedance state after an 8-bit
transfer is completed.
Figure 25 shows serial I/O timing.
Fig. 25 Serial I/O timing
D1
D0
D2
D3
D4
D5
D6
D7
First
Last
STXD/SRXD
Synchronizing clock
SCLK (CPoL = 1, CPha =1 )
SCLK (CPoL = 0, CPha = 1)
SCLK (CPoL = 1, CPha = 0)
SCLK (CPoL = 0, CPha = 0)
qNormal mode timing (LSB first)
Transfer clock
Synchronizing clock
Serial I/O shift
register write signal
SRDY signal
Serial I/O output STXD
Serial I/O input SRXD
(Note)
Interrupt request bit is set to “1”.
Note: When the internal clock is selected as the transfer clock, the STXD pin goes to a high-impedance state after transfer completion.
qSPI compatible mode timing
SRDY signal
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PDF描述
M37641M8-XXXFP 8-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP80
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相关代理商/技术参数
参数描述
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