MC68HC705J1A Memory Map - Motorola

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MC68HC705J1A

Manufacturer Part Number
MC68HC705J1A
Description
Manufacturer
Motorola
Datasheet

Specifications of MC68HC705J1A

Case
DIP-20L
Memory
2.3 Memory Map
$0000
I/O Registers
32 Bytes
$001F
$0020
Unimplemented
160 Bytes
$00BF
$00C0
RAM
64 Bytes
$00FF
$0100
Unimplemented
512 Bytes
$02FF
$0300
EPROM
1232 Bytes
$07CF
$07D0
Unimplemented
30 Bytes
$07ED
$07EE
Test ROM
2 Bytes
$07EF
$07F0
Registers and EPROM
16 Bytes
$07FF
(1)
Writing to bit 0 of $07F0 clears the computer
operating properly (COP) watchdog.
Technical Data
34
Port A Data Register (PORTA)
Port B Data Register (PORTB)
Data Direction Register A (DDRA)
Data Direction Register B (DDRB)
Timer Status and Control Register (TSCR)
Timer Control Register (TCR)
IRQ Status and Control Register (ISCR)
Pulldown Register Port A (PDRA)
Pulldown Register Port B (PDRB)
EPROM Programming Register (EPROG)
COP Register (COPR)
Mask Option Register (MOR)
Timer Interrupt Vector High
Timer Interrupt Vector Low
External Interrupt Vector High
External Interrupt Vector Low
Software Interrupt Vector High
Software Interrupt Vector Low
Figure 2-1. Memory Map
Memory
$0000
$0001
$0002
Unimplemented
$0003
$0004
$0005
$0006
Unimplemented
$0007
$0008
$0009
$000A
$000B
Unimplemented
$000F
$0010
$0011
$0012
Unimplemented
$0017
$0018
$0019
Unimplemented
$001E
Reserved
$001F
(1)
$07F0
$07F1
$07F2
Reserved
$07F7
$07F8
$07F9
$07FA
$07FB
$07FC
$07FD
Reset Vector High
$07FE
Reset Vector Low
$07FF
MC68HC705J1A — Rev. 4.0
MOTOROLA

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