User`s manual

FUNCTIONAL DESCRIPTION
M68332BCC/D 4-5 MOTOROLA
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4.2.1.8 Test Module
The test module consolidates the microcontroller test logic into a single block to facilitate
production testing, user self-test, and system diagnostics. Scan paths throughout the MC68332
provide signature analysis checks on internal logic. User self-test is initiated by asserting the test
pin to enter test mode. This test provides a pass/fail response to various externally supplied test
vectors.
4.2.2 User Memory
On board the BCC is 32k x 16 bits of RAM and 64k x 16 bits of EPROM. The RAM is the
debug monitor storage area and user accessible memory space; the M68CPU32BUG Debug
Monitor is stored in the BCC EPROMs. For debug monitor functionality see the
M68CPU32BUG Debug Monitor User’s Manual, M68CPU32BUG/AD1. Figure 4-3 is the EVK
memory map.
The PFB has sockets for 32k x 16 or 64k x 16 bit RAM or 64k x 16 bit EPROM. The RAM
and/or EPROM, supplied by the user, is user-accessible memory space.
4.2.3 Terminal and Host Computer I/O Port
The MC68332 MCU serial communication interface pins drive levels are 0 and 5 Vdc. An
interface device (U5) translates these voltage levels to +/-10 Vdc, sufficient to allow RS-232C
communications.
The RS-232C serial communication port P4 facilitates terminal and host computer
interconnection. If a host computer is used a terminal emulation package (PCKERMIT.EXE,
PROCOMM, MacTerminal, White Knight, etc.) must be utilized. Chapter 5 contains a
description of P4 pin assignments.
4.2.4 Background Mode Interface Port
The background debug mode is implemented in MCU microcode. In background mode, registers
can be viewed or altered, memory can be read or written, and test features can be executed.
Background mode is initiated by one of several sources: externally generated breakpoints,
internal peripherally generated breakpoints, software, and catastrophic exception conditions.
Instruction execution is suspended for the duration of background mode. Background mode
communications between the BCC and the development system are via a serial link (P3).