Datasheet
Table Of Contents
- Revision History
- List of Chapters
- Table of Contents
- Chapter 1 General Description
- 1.1 Introduction
- 1.2 Features
- 1.3 MCU Block Diagram
- 1.4 Pin Assignments
- 1.5 Pin Functions
- 1.5.1 Power Supply Pins (VDD and VSS)
- 1.5.2 Oscillator Pins (OSC1 and OSC2)
- 1.5.3 External Reset Pin (RST)
- 1.5.4 External Interrupt Pin (IRQ)
- 1.5.5 CGM Power Supply Pins (VDDA and VSSA)
- 1.5.6 External Filter Capacitor Pin (CGMXFC)
- 1.5.7 ADC Power Supply/Reference Pins (VDDAD/VREFH and VSSAD/VREFL)
- 1.5.8 Port A Input/Output (I/O) Pins (PTA7/KBD7/AD15-PTA0/KBD0/AD8)
- 1.5.9 Port B I/O Pins (PTB7/AD7-PTB0/AD0)
- 1.5.10 Port C I/O Pins (PTC6-PTC0)
- 1.5.11 Port D I/O Pins (PTD7/T2CH1-PTD0/SS)
- 1.5.12 Port E I/O Pins (PTE5-PTE2, PTE1/RxD, and PTE0/TxD)
- 1.5.13 Port F I/O Pins (PTF7/T2CH5-PTF0)
- 1.5.14 Port G I/O Pins (PTG7/AD23-PTBG0/AD16)
- 1.5.15 Unused Pin Termination
- Chapter 2 Memory
- 2.1 Introduction
- 2.2 Unimplemented Memory Locations
- 2.3 Reserved Memory Locations
- 2.4 Input/Output (I/O) Section
- 2.5 Random-Access Memory (RAM)
- 2.6 FLASH-1 Memory (FLASH-1)
- 2.7 FLASH-2 Memory (FLASH-2)
- Chapter 3 Analog-to-Digital Converter (ADC)
- Chapter 4 Clock Generator Module (CGM)
- 4.1 Introduction
- 4.2 Features
- 4.3 Functional Description
- 4.4 I/O Signals
- 4.4.1 Crystal Amplifier Input Pin (OSC1)
- 4.4.2 Crystal Amplifier Output Pin (OSC2)
- 4.4.3 External Filter Capacitor Pin (CGMXFC)
- 4.4.4 PLL Analog Power Pin (Vdda)
- 4.4.5 PLL Analog Ground Pin (Vssa)
- 4.4.6 Oscillator Enable Signal (SIMOSCEN)
- 4.4.7 Oscillator Enable in Stop Mode Bit (OSCENINSTOP)
- 4.4.8 Crystal Output Frequency Signal (CGMXCLK)
- 4.4.9 CGM Base Clock Output (CGMOUT)
- 4.4.10 CGM CPU Interrupt (CGMINT)
- 4.5 CGM Registers
- 4.6 Interrupts
- 4.7 Special Modes
- 4.8 Acquisition/Lock Time Specifications
- Chapter 5 Configuration Register (CONFIG)
- Chapter 6 Computer Operating Properly (COP) Module
- Chapter 7 Central Processor Unit (CPU)
- Chapter 8 External Interrupt (IRQ)
- Chapter 9 Keyboard Interrupt Module (KBI)
- Chapter 10 Low-Power Modes
- 10.1 Introduction
- 10.2 Analog-to-Digital Converter (ADC)
- 10.3 Break Module (BRK)
- 10.4 Central Processor Unit (CPU)
- 10.5 Clock Generator Module (CGM)
- 10.6 Computer Operating Properly Module (COP)
- 10.7 External Interrupt Module (IRQ)
- 10.8 Keyboard Interrupt Module (KBI)
- 10.9 Low-Voltage Inhibit Module (LVI)
- 10.10 Enhanced Serial Communications Interface Module (ESCI)
- 10.11 Serial Peripheral Interface Module (SPI)
- 10.12 Timer Interface Module (TIM1 and TIM2)
- 10.13 Timebase Module (TBM)
- 10.14 Exiting Wait Mode
- 10.15 Exiting Stop Mode
- Chapter 11 Low-Voltage Inhibit (LVI)
- Chapter 12 Input/Output (I/O) Ports
- Chapter 13 Enhanced Serial Communications Interface (ESCI) Module
- Chapter 14 System Integration Module (SIM)
- Chapter 15 Serial Peripheral Interface (SPI) Module
- Chapter 16 Timebase Module (TBM)
- Chapter 17 Timer Interface Module (TIM1)
- Chapter 18 Timer Interface Module (TIM2)
- Chapter 19 Development Support
- Chapter 20 Electrical Specifications
- 20.1 Introduction
- 20.2 Absolute Maximum Ratings
- 20.3 Functional Operating Range
- 20.4 Thermal Characteristics
- 20.5 5.0-Vdc Electrical Characteristics
- 20.6 3.3-Vdc Electrical Characteristics
- 20.7 5.0-Volt Control Timing
- 20.8 3.3-Volt Control Timing
- 20.9 Clock Generation Module (CGM) Characteristics
- 20.10 5.0-Volt ADC Characteristics
- 20.11 3.3-Volt ADC Characteristics
- 20.12 5.0-Volt SPI Characteristics
- 20.13 3.3-Volt SPI Characteristics
- 20.14 Timer Interface Module Characteristics
- 20.15 Memory Characteristics
- Chapter 21 Ordering Information and Mechanical Specifications
- Appendix A MC68HC908GR48A
- Appendix B MC68HC908GR32A
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
Freescale Semiconductor 201
Chapter 15
Serial Peripheral Interface (SPI) Module
15.1 Introduction
This section describes the serial peripheral interface (SPI) module, which allows full-duplex, synchronous,
serial communications with peripheral devices.
The text that follows describes the SPI. The SPI I/O pin names are SS
(slave select), SPSCK (SPI serial
clock), MOSI (master out slave in), and MISO (master in/slave out). The SPI shares four I/O pins with four
parallel I/O ports.
15.2 Features
Features of the SPI module include:
• Full-duplex operation
• Master and slave modes
• Double-buffered operation with separate transmit and receive registers
• Four master mode frequencies (maximum = bus frequency ÷ 2)
• Maximum slave mode frequency = bus frequency
• Serial clock with programmable polarity and phase
• Two separately enabled interrupts:
– SPRF (SPI receiver full)
– SPTE (SPI transmitter empty)
• Mode fault error flag with CPU interrupt capability
• Overflow error flag with CPU interrupt capability
• Programmable wired-OR mode
• I/O (input/output) port bit(s) software configurable with pullup device(s) if configured as input port
bit(s)
15.3 Functional Description
The SPI module allows full-duplex, synchronous, serial communication between the MCU and peripheral
devices, including other MCUs. Software can poll the SPI status flags or SPI operation can be interrupt
driven.
If a port bit is configured for input, then an internal pullup device may be enabled for that port bit.
The following paragraphs describe the operation of the SPI module. Refer to Figure 15-3 for a summary
of the SPI I/O registers.