參數(shù)資料
型號: MC68HC05P18A
廠商: Motorola, Inc.
英文描述: Low Cost HCMOS Microcontroller(低成本、8位HCMOS微控制器)
中文描述: 低成本HCMOS微控制器(低成本,8位HCMOS微控制器)
文件頁數(shù): 77/130頁
文件大小: 1200K
代理商: MC68HC05P18A
MC68HC05P18A
Technical Data
MOTOROLA
Serial Input/Output Ports (SIOP)
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Technical Data — MC68HC05P18A
Section 9. Serial Input/Output Ports (SIOP)
9.1 Contents
9.2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
9.3
9.3.1
9.3.2
9.3.3
SIOP Signal Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Serial Clock (SCK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Serial Data Input (SDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Serial Data Output (SDO). . . . . . . . . . . . . . . . . . . . . . . . . . .79
9.4
9.4.1
9.4.2
9.4.3
SIOP Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
SIOP Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
SIOP Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
SIOP Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
9.2 Introduction
The simple synchronous serial input/output (I/O) port (SIOP) subsystem
is designed to provide efficient serial communications between
peripheral devices or other MCUs. The SIOP is implemented as a 3-wire
master/slave system with:
Serial clock (SCK)
Serial data input (SDI)
Serial data output (SDO)
A block diagram of the SIOP is shown in
Figure 9-1
.
The SIOP subsystem shares its input/output pins with port B. When the
SIOP is enabled, SPE bit set in the SIOP control register (SCR), port B
data direction register (DDR), and data register are modified by the
SIOP. Although port B DDR and data registers can be altered by
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