mc68hc05j5ap Freescale Semiconductor, Inc, mc68hc05j5ap Datasheet - Page 20

• Manufacturer Part Number: mc68hc05j5ap
• Description: General Description The Mc68hc05j5a Is A Member Of The Low-cost High-performance M68hc05 Family Of 8-bit Microcontroller Units Mcus . The M68hc05 Family Is Based On The Customer-speci Ed Integrated Circuit Design Strategy. All Mcus In The Family
• Manufacturer: Freescale Semiconductor, Inc

GENERAL RELEASE SPECIFICATION
2.1
2.2
2.3
2-2
I/O AND CONTROL REGISTERS
The I/O and Control Registers reside in locations $0000-$001F. The overall orga-
nization of these registers is shown in Figure 2-2. The bit assignments for each
register are shown in Figure 2-3 and Figure 2-4. Reading from unimplemented
bits will return unknown states, and writing to unimplemented bits will be ignored.
RAM
The total RAM consists of 128 bytes (including the stack) at locations $0080
through $00FF. The stack begins at address $00FF and proceeds down to $00C0.
Using the stack area for data storage or temporary work locations requires care to
prevent it from being overwritten due to stacking from an interrupt or subroutine
call.
ROM
There are a total of 2570 bytes of user ROM on-chip. This includes 2560 bytes of
user ROM from locations $0300 to $0CFF for user program storage and 10 bytes
for user vectors from locations $0FF6 to $0FFF.
Freescale Semiconductor, Inc.
Figure 2-2. I/O Registers Memory Map
For More Information On This Product,
MFT Control & Status Register
IRQ Control & Status Register
Port A Data Direction Register
Port B Data Direction Register
Timer1 Capture Control Register
Port A Pulldown/up Register
Port B Pulldown/up Register
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MFT Counter Register
Timer1 Registers (4)
Port A Data Register
Port B Data Register
Timer1 Registers (4)
unimplemented (2)
unimplemented (5)
unimplemented (2)
Reserved for Test
unimplemented (3)
unimplemented (1)
Reserved
July 16, 1999
MEMORY
$0000
$0001
$0002
$0003
$0004
$0005
$0008
$0009
$000A
$0010
$0011
$0012
$0015
$0018
$001B
$001E
$001F
MC68HC05J5A
REV 2.1