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
Development Support
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
264 Freescale Semiconductor
When the internal address bus matches the value written in the break address registers or when software
writes a 1 to the BRKA bit in the break status and control register, the CPU starts a break interrupt by:
• Loading the instruction register with the SWI instruction
• Loading the program counter with $FFFC and $FFFD ($FEFC and $FEFD in monitor mode)
The break interrupt timing is:
• When a break address is placed at the address of the instruction opcode, the instruction is not
executed until after completion of the break interrupt routine.
• When a break address is placed at an address of an instruction operand, the instruction is executed
before the break interrupt.
• When software writes a 1 to the BRKA bit, the break interrupt occurs just before the next instruction
is executed.
By updating a break address and clearing the BRKA bit in a break interrupt routine, a break interrupt can
be generated continuously.
CAUTION
A break address should be placed at the address of the instruction opcode.
When software does not change the break address and clears the BRKA
bit in the first break interrupt routine, the next break interrupt will not be
generated after exiting the interrupt routine even when the internal address
bus matches the value written in the break address registers.
19.2.1.1 Flag Protection During Break Interrupts
The system integration module (SIM) controls whether or not module status bits can be cleared during
the break state. The BCFE bit in the break flag control register (BFCR) enables software to clear status
bits during the break state. See 14.7.3 Break Flag Control Register and the Break Interrupts subsection
for each module.
19.2.1.2 TIM During Break Interrupts
A break interrupt stops the timer counter and inhibits input captures.
19.2.1.3 COP During Break Interrupts
The COP is disabled during a break interrupt when V
TST
is present on the RST pin.
19.2.2 Break Module Registers
These registers control and monitor operation of the break module:
• Break status and control register (BRKSCR)
• Break address register high (BRKH)
• Break address register low (BRKL)
• Break status register (BSR)
• Break flag control register (BFCR)