參數(shù)資料
型號: MC68HC805P18MDWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, EEPROM, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 3/144頁
文件大小: 1348K
代理商: MC68HC805P18MDWR2
Advance Information
MC68HC(8)05P18 — Rev. 2.0
100
Serial Input/Output Port (SIOP)
MOTOROLA
Serial Input/Output Port (SIOP)
Figure 11-1. SIOP Block Diagram
11.3 SIOP Signal Format
The SIOP subsystem is software configurable for master or slave
operation. No external mode selection inputs are available (such as the
slave select pin).
11.3.1 Serial Clock (SCK)
The state of the serial clock (SCK) output normally remains a logic 1
during idle periods between data transfers. The first falling edge of SCK
signals the beginning of a data transfer. At this time, the first bit of
received data is accepted at the SDI pin and the first bit of transmitted
data is presented at the SDO pin (see Figure 11-2). Data is captured at
the SDI pin on the rising edge of SCK, and the first bit of transmitted data
is presented at the SDO pin. The transfer is terminated upon the eighth
rising edge of SCK.
8-BIT
SHIFT
REGISTER
STATUS
REGISTER
BAUD
RATE
CONTROL
REGISTER
GENERATOR
HCO5 INTERNAL BUS
PH2 CLOCK
SCK
SDI
SDO
76 54 32 10
765 43 21 0
76 54 32 10
I/O
$0B
$0C
$0A
CONTROL
LOGIC
SPE
SDI/PB6
SCK/PB7
SDO/PB5
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