FREESCALE MC68HC912B32FU8

Freescale Semiconductor, Inc.
M68EVB912B32/D
Rev. 1
M68EVB912B32 Evaluation Board
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Overview
The M68EVB912B32 evaluation board (EVB) is an economical tool for
designing and debugging code for and evaluating the operation of the
MC68HC912B32 MCU. By providing the essential MCU timing and
input/output (I/O) circuitry, the EVB simplifies user evaluation of prototype
hardware and software.
The EVB features a prototype area, which allows custom interfacing with the
MCU’s I/O and bus lines. These connections are broken out via on-board
headers immediately adjacent to the MCU.
Figure 1 shows the EVB’s layout and locations of the major components as
viewed from the component side of the board.
PROTOTYPE
AREA
RESET SWITCH
MC68HC912B32MCU
BACKGROUND
DEBUG MODE OUT
RS-232C
DB-9
CONNECTOR
BACKGROUND
DEBUG MODE IN
POWER
CONNECTOR
VPP INPUT
Figure 1. Evaluation Board Layout
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M68EVB912B32 Evaluation Board
Features
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Components
+4.5 to +5.5 Vdc operation
RS-232C interface
32 Kbytes of MCU internal FLASH EEPROM with resident D-Bug12
monitor/debugger program
Four operational modes:
– EVB
– Jump-to-EEPROM
– BDM pod (background debug mode)
– Bootload
Header connectors for access to the MCU’s I/O and bus lines
On-board prototype area for customized interfacing with the MCU
Low-voltage inhibit protection
Full support for either dumb terminal or host computer terminal interface
IASM12 assembly language development toolkit
File transfer capability from a host computer, allowing off-board code
generation
The EVB is composed of three components:
1. Hardware — The board is a 5.15-inch x 3.4-inch
(13.08-cm x 8.63-cm) multilayer printed circuit board (PCB) that
provides the platform for interface and power connections to the
MC68HC912B32 MCU. The MCU is surface mounted to the PCB.
2. Firmware — D-Bug12, the EVB’s firmware-resident monitor program,
provides a self-contained operating environment that allows writing,
evaluating, and debugging user programs.
The hardware is factory configured to execute D-Bug12 without further
configuration by the user. It is ready for writing and debugging user code
with an RS-232C terminal.
Commands are typed on the terminal’s D-Bug12 prompt line and
executed when the carriage return (ENTER) key is pressed. D-Bug12 then
displays either the appropriate response to the command or an error
indication.
3. Software — The ISAM12 assembly language toolset provides an
integrated development environment which includes a project manager,
relocatable macro-assembler, linker, librarian, Motorola S-record
generator, and a variety of other tools.
Features
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M68EVB912B32 Evaluation Board
User Code
Generation
EVB user code can be generated by two methods:
1. For small programs or subroutines, D-Bug12’s single-line
assembler/disassembler may be used to place object code directly into
the EVB’s memory.
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2. For larger programs, the IASM12 assembler may be used on a host
computer to generate S-record object files, which then can be loaded into
the EVB’s memory using D-Bug12’s FLOAD or LOAD command.
If the M68HC912B32’s BDM interface serves as the user interface, the SCI
(serial communication interface) port becomes available for user applications.
This mode requires a background debug development tool, such as Motorola’s
SDI interface, and a host computer with the appropriate interface software or
another B32EVB.
At reset, the EVB can begin operation in either of four jumper-selectable
modes:
1. In EVB mode, D-Bug12 immediately issues its command prompt on the
terminal display and waits for a user entry.
2. In the jump-to-EEPROM mode, execution begins directly with the user
code in on-chip EEPROM.
3. In BDM pod mode, D-Bug12 serves as a probe interface between a target
system and the user via the BDM out connector.
4. In bootload mode, a user program may be loaded into the host EVB’s
byte-erasable or FLASH EEPROM memory.
EVB
Specifications
and PC
Requirements
Information in these tables summarizes EVB specifications and minimum host
PC requirements.
Table 1. EVB Specifications
Characteristic
Specification
MCU
MC68HC912B32
MCU I/O ports
HCMOS compatible
FLASH
32 Kbytes
EEPROM
768 bytes
Communications ports
2 RS-232C DCE ports
Board dimensions
5.15 inches x 3.4 inches; 13.08 cm x 8.63 cm
SRAM
1 Kbyte
User Code Generation
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N O N - D I S C L O S U R E
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A G R E E M E N T
R E Q U I R E D
M68EVB912B32 Evaluation Board
Table 2. Host PC Minimum Requirements
Characteristic
Ordering
Information
Specification
Terminal
RS-232C compatible terminal
Host PC, optional
386-based PC or higher with an RS-232C serial port;
requires a user-supplied communications program
capable of emulating a dumb terminal
Input/output
Serial communication port
Cable
RS232C compatible, 6-pin BDM target cable
External power supply
+4.5 to +5.5 Vdc @ 100 mA maximum
Refer to Table 3 for ordering information.
Table 3. Ordering Information
Evaluated MCU
MC68HC912B32FU8
EVB Part Number
M68EVB912B32
Software
IASM12, included with EVB
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Warranty
Motorola provides a 1-year limited warranty.
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© Motorola, Inc., 1999
M68EVB912B32/D
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