Microcontroller Memory And Peripheral Usage; Memory Usage - Motorola M68HC08 Manual

Software Design

6.5 Microcontroller Memory and Peripheral Usage

Designer Reference Manual
58
Freescale Semiconductor, Inc.
Table 6-5. Memory Usage
the 3-phase BLDC drive using the MC68HC908QY4 microcontroller. A
significant part of the microcontroller memory is still available for other
tasks.
Memory
FLASH
RAM
The MC68HC908QY4 microcontroller offers many features that simplify
the drive design. Table 6-6. MC68HC908QY4 Modules Usage
describes the individual available blocks and their use in the introduced
system.
Table 6-6. MC68HC908QY4 Modules Usage
Module available on
MC68HC908QY2/4
Timer (2-channel)
KeyBoard Interface
I/O ports
Clock Generation
COP
IRQ
LVI
ADC
Software Design
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shows how much memory is needed to run
Table 6-5. Memory Usage
Available
(MC68HC90QY4)
4096 Bytes
128 Bytes
Used
PWM generation (TCH0)
yes Input Capture for measurement of
actual motor speed (TCH1)
no
User interface, generation of gate
yes
yes on-chip clock generation
yes
yes
yes
yes
DC-Bus voltage measurement
Used
1650 Bytes
110 Bytes
(including 80 Bytes
Stack)
Purpose
signals
S/W runaway protection
fault protection
Low voltage protection
Speed set-up
DRM046 — Rev 0
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