參數(shù)資料
型號： M37540E8GP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO36
封裝： 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-36
文件頁數(shù)： 32/88頁
文件大?。?/td> 872K
代理商： M37540E8GP
7540 Group
Rev.4.00
Jun 21, 2004
page 38 of 82
REJ03B0011-0400Z
qSerial I/O2
The serial I/O2 function can be used only for clock synchronous
serial I/O.
For clock synchronous serial I/O2 the transmitter and the receiver
must use the same clock. When the internal clock is used, transfer
is started by a write signal to the serial I/O2 register.
Note: Serial I/O2 can be used in the following cases;
(1) Serial I/O1 is not used,
(2) Serial I/O1 is used as UART and BRG output divided by 16 is
selected as the synchronized clock.
[Serial I/O2 control register] SIO2CON
The serial I/O2 control register contains 8 bits which control vari-
ous serial I/O functions.
Set “0” to bit 3 to receive.
At reception, clear bit 7 to “0” by writing a dummy data to the se-
rial I/O2 register after completion of shift.
Fig. 35 Structure of serial I/O2 control registers
Fig. 36 Block diagram of serial I/O2
Internal synchronous clock selection bits
000 : f(XIN)/8
001 : f(XIN)/16
010 : f(XIN)/32
011 : f(XIN)/64
110 : f(XIN)/128
111 : f(XIN)/256
b7
b0
Not used
(returns “0” when read)
Transfer direction selection bit
0 : LSB first
1 : MSB first
SCLK2 pin selection bit
0 : External clock (SCLK2 is an input)
1 : Internal clock (SCLK2 is an output)
Transmit / receive shift completion flag
0 : shift in progress
1 : shift completed
Note : When using it as a SDATA input, set the port P13
direction register to “0”.
Serial I/O2 control register
(SIO2CON: address 003016, initila value: 0016)
SDATA2 pin selection bit (Note)
0 : I/O port / SDATA2 input
1 : SDATA2 output
“1”
“0”
“1”
“0”
“1”
1/8
1/16
1/32
1/64
1/128
1/256
XIN
Data bus
Serial I/O2
interrupt request
SDATA2 pin selection bit
Serial I/O counter 2 (3)
Serial I/O shift register 2 (8)
SCLK2 pin selection bit
Internal synchronous
clock selection bits
Divider
P12/SCLK2
P13/SDATA2
P12 latch
SCLK2 pin
selection bit
SCLK
P13 latch
SDATA2 pin selection bit
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參數(shù)描述
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