XC68HC705JJ7 Motorola, XC68HC705JJ7 Datasheet - Page 141

• Manufacturer Part Number: XC68HC705JJ7
• Description: MICROCONTROLLER
• Manufacturer: Motorola

9.1 Contents
9.2 Introduction
MC68HC705JJ7 • MC68HC705JP7 — REV 4
MOTOROLA
Advance Information — MC68HC705JJ7/MC68HC705JP7
Section 9. Simple Synchronous Serial Interface
9.2
9.3
9.3.1
9.3.2
9.3.3
9.4
9.4.1
9.4.2
9.4.3
The simple synchronous serial I/O port (SIOP) subsystem is designed to
provide efficient serial communications with peripheral devices or other
MCUs. 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
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.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
SIOP Signal Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
SIOP Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Simple Synchronous Serial Interface
Serial Clock (SCK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Serial Data Input (SDI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Serial Data Output (SDO). . . . . . . . . . . . . . . . . . . . . . . . . . 144
SIOP Control Register (SCR). . . . . . . . . . . . . . . . . . . . . . . 145
SIOP Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
SIOP Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Figure
9-1.
Advance Information
141