MC68HC705J2 Datasheet, PDF (14/82 Pages) Freescale Semiconductor, Inc – member of the low-cost

Freescale Semiconductor, Inc.
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• One Time Programmable 20-Pin Small Outline Integrated Circuit (SOIC)
• Windowed 20-Pin Cerdip
1.2 Structure
Figure 1-1 shows the organization of the MC68HC705J2 EPROM MCU.
IRQ/VPP
RESET
OSC1
OSC2
VDD
VSS
USER EPROM — 2064 BYTES
BOOTLOADER ROM — 239 BYTES
SRAM — 112 BYTES
M68HC05
CPU
7
0
ACCUMULATOR
7
0
RST
INDEX REGISTER
15
75
0000000011
0
STACK POINTER
15
11
00000
0
PROGRAM COUNTER
7
0
111H I NZC
CONDITION CODE REGISTER
OSCILLATOR
DIVIDE
fop
BY 2
COP TIMER
AND
ILLEGAL ADDRESS DETECT
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
PB5
PB4
PB3
PB2
PB1
PB0
15-STAGE
MULTIFUNCTION TIMER
POWER
Figure 1-1. MC68HC705J2 Block Diagram
INTRODUCTION
1-2
Rev. 2
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