參數資料
型號: MCR705JP7CDWE
廠商: Freescale Semiconductor
文件頁數: 161/164頁
文件大?。?/td> 0K
描述: MCU 8BIT 224B RAM 28-SOIC
標準包裝: 26
系列: HC05
核心處理器: HC05
芯體尺寸: 8-位
速度: 2.1MHz
連通性: SIO
外圍設備: POR,溫度傳感器,WDT
輸入/輸出數: 22
程序存儲器容量: 6KB(6K x 8)
程序存儲器類型: OTP
RAM 容量: 224 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數據轉換器: A/D 4x12b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
包裝: 管件
Simple Synchronous Serial Interface
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
96
Freescale Semiconductor
The SIOP subsystem shares its input/output pins with port B. When the SIOP is enabled (SPE bit set in
the SCR), the port B data direction and data registers are bypassed by the SIOP. The port B data direction
and data registers will remain accessible and can be altered by the application software, but these actions
will not affect the SIOP transmitted or received data.
9.2 SIOP Signal Format
The SIOP subsystem can be software configured for master or slave operation. No external mode
selection inputs are available (for instance, no slave select pin).
9.2.1 Serial Clock (SCK)
The state of the SCK output remains a fixed logic level during idle periods between data transfers. The
edges of SCK indicate the beginning of each output data transfer and latch any incoming data received.
The first bit of transmitted data is output from the SDO pin on the first falling edge of SCK. The first bit of
received data is accepted at the SDI pin on the first rising edge of SCK after the first falling edge. The
transfer is terminated upon the eighth rising edge of SCK.
The idle state of the SCK is determined by the state of the CPHA bit in the SCR. When the CPHA is clear,
SCK will remain idle at a logic 1 as shown in Figure 9-2. When the CPHA is set, SCK will remain idle at
a logic 0 as shown in Figure 9-3. In both cases, the SDO changes data on the falling edge of the SCK,
and the SDI latches data in on the rising edge of SCK.
Figure 9-2. SIOP Timing Diagram (CPHA = 0)
Figure 9-3. SIOP Timing Diagram (CPHA = 1)
The only difference in the master and slave modes of operation is the sourcing of the SCK. In master
mode, SCK is driven from an internal source within the MCU. In slave mode, SCK is driven from a source
external to the MCU. The SCK frequency is based on one of four divisions of the oscillator clock that is
selected by the SPR0 and SPR1 bits in the SCR.
SCK
SDO
SDI
100 ns
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
(CPHA = 0)
(IDLE = 1)
SCK
SDO
SDI
100 ns
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
(CPHA = 1)
(IDLE = 0)
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