参数资料
型号: MC68HC705P6AS
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, SDIP-28
文件页数: 86/130页
文件大小: 1541K
代理商: MC68HC705P6AS
MC68HC705P6A — Rev. 2.0
Advance Information
MOTOROLA
Serial Input/Output Port (SIOP)
59
Advance Information — MC68HC705P6A
Section 7. Serial Input/Output Port (SIOP)
7.1 Contents
7.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
7.3
SIOP Signal Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
7.3.1
Serial Clock (SCK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
7.3.2
Serial Data Input (SDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
7.3.3
Serial Data Output (SDO). . . . . . . . . . . . . . . . . . . . . . . . . . . 61
7.4
SIOP Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.4.1
SIOP Control Register (SCR) . . . . . . . . . . . . . . . . . . . . . . . .62
7.4.2
SIOP Status Register (SSR) . . . . . . . . . . . . . . . . . . . . . . . .63
7.4.3
SIOP Data Register (SDR). . . . . . . . . . . . . . . . . . . . . . . . . . 64
7.2 Introduction
The simple synchronous serial 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), and serial data output
(SDO). A block diagram of the SIOP is shown in Figure 7-1. A mask
programmable option determines whether the SIOP is MSB or LSB first.
The SIOP subsystem shares its input/output pins with port B. When the
SIOP is enabled (SPE bit set in register SCR), port B DDR and data
registers are modified by the SIOP. Although port B DDR and data
registers can be altered by application software, these actions could
affect the transmitted or received data.
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