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參數(shù)資料
| 型號： | MC68HC05P9ACDW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 36/90頁 |
| 文件大?。?/td> | 285K |
| 代理商： | MC68HC05P9ACDW |
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GENERAL RELEASE SPECIFICATION
MC68HC05P9A
SIMPLE SERIAL INPUT/OUTPUT PORT
MOTOROLA
Rev. 2.0
7-3
7.2
SIOP Registers
The following paragraphs describe the SIOP registers.
7.2.1 SIOP Control Register (SCR)
This register is located at address $000A and contains two bits.
SPE — Serial Peripheral Enable
When set, this bit enables the serial I/O port and initializes the port B DDR such
that PB5 (SDO) is output, PB6 (SDI) is input and PB7 (SCK) is input (slave
mode only). The port B DDR can be altered subsequently as the application
requires and the port B data register (except for PB5) can be manipulated as
usual. However, these actions could affect the transmitted or received data.
When SPE is cleared, port B reverts to standard parallel I/O without affecting
the port B data register or DDR. SPE is readable and writable any time but
clearing SPE while a transmission is in progress will abort the transmission,
reset the bit counter, and return port B to its normal I/O function. Reset clears
this bit.
MSTR — Master Mode
When set, this bit congures the SIOP for master mode. This means that the
transmission is initiated by a write to the data register and the SCK pin
becomes an output providing a synchronous data clock at a xed rate of E (bus
clock) divided by four. While the device is in master mode, the SDO and SDI
pins do not change function. These pins behave exactly as they would in slave
mode.
Reset clears this bit and congures the SIOP for slave operation.
MSTR may be set at any time regardless of the state of SPE. Clearing MSTR
will abort any transmission in progress.
$0A
0
SPE
0
MSTR
0000
RESET:
00000000
Figure 7-3. SIOP Control Register
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC05P9ACP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
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| MC68HC05P9AMDW | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05P9AMP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05P9AP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
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