參數(shù)資料
型號(hào): HMS81C2020AQ
廠商: Electronic Theatre Controls, Inc.
英文描述: CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver
中文描述: CMOS單芯片8位微控制器與A / D轉(zhuǎn)換器
文件頁(yè)數(shù): 66/107頁(yè)
文件大?。?/td> 1482K
代理商: HMS81C2020AQ
HMS81C2012A/2020A
62
SEP. 2004 Ver 2.00
14. SERIAL PERIPHERAL INTERFACE
The Serial Peripheral Interface (SPI) module is a serial in-
terface useful for communicating with other peripheral of
microcontroller devices. These peripheral devices may be
serial EEPROMs, shift registers, display drivers, A/D con-
verters, etc. The Serial Peripheral Interface(SPI) is 8-bit
clock synchronous type and consists of serial I/O register,
serial I/O mode register, clock selection circuit octal
counter and control circuit. The SOUT pin is designed to
input and output. So Serial Peripheral Interface(SPI) can
be operated with minimum two pin
Figure 14-1 SPI Block Diagram
÷
4
÷
16
XIN PIN
P
MUX
SCK[1:0]
00
01
10
11
SCLK PIN
SPI
Shift
Input shift register
SIOR
Clock
Clock
Octal
Counter
Serial communication
Interrupt
SIOIF
SOUT
IOSWIN
Internal Bus
SIOSF
SCK[1:0]
“11”
overflow
not “11”
Complete
Timer0
Overflow
SIN PIN
IOSW
PIN
SOUT
IOSWIN
CONTROL
CIRCUIT
“0”
“1”
POL
1
0
Start
SIOST
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