参数资料
型号: MC68HC05P9AMDW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 16/158页
文件大小: 3885K
代理商: MC68HC05P9AMDW
SIOP
112
SIOP
I/O Registers
The following registers control and monitor SIOP operation:
SIOP control register (SCR)
SIOP status register (SSR)
SIOP data register (SDR)
SIOP Control
Register
The read/write SIOP control register (SCR) contains two bits. One bit
enables the SIOP, and the other configures the SIOP for master mode
or for slave mode.
SPE — SIOP Enable
This read/write bit enables the SIOP. Setting SPE initializes the data
direction register as follows:
The PB6/SDI pin is an input.
The PB5/SDO pin is an output.
The PB7/SCK pin is an input in slave mode and an output in
master mode.
Clearing SPE disables the SIOP and returns the port to its normal I/O
functions. The data direction register and the port data register remain
in their SIOP-initialized state.
NOTE:
After clearing SPE, be sure to initialize the port for its intended I/O use.
$000A
Bit 7
654321
Bit 0
Read:
0
SPE
0
MSTR
0000
Write:
Reset:
00000000
= Unimplemented
Figure 64. SIOP Control Register (SCR)
14-mc68hc05p9a
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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