HARDWARE DESCRIPTION
The EVBU allows the user to use all the features of the monitor BUFFALO program, however it
should be noted that the monitor program uses the MCU on-chip RAM locations $0048-$00FF
leaving approximately 325 bytes of RAM for the user (i.e., $0000-$0047 and $0100-$01FF). 512
bytes of EEPROM are also available for user programs.
MCU
PD0-PD5
PC0-PC7
PB0-PB7
PA0-PB7
5-2
RXD/PD0
TXD/PD1
PD2-PD5
XIRQ
PE0-PE7
Figure 5-1. EVBU Block Diagram
RXD
RS-232C
TXD
DRIVERS
AND
RECEIVER
CONTROL
REAL-TIME
CLOCK,
RAM,
SERIAL
INTERFACE
WIRE-WRAP AREA
TERMINAL
BATTERY
BACKUP
M68HC11EVBU/D