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MC146805E2CFN Datenblatt(PDF) 7 Page - InnovASIC, Inc

Teilenummer MC146805E2CFN
Bauteilbeschribung  Microprocessor Unit
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Hersteller  INNOVASIC [InnovASIC, Inc]
Direct Link  http://www.innovasic.com
Logo INNOVASIC - InnovASIC, Inc

MC146805E2CFN Datenblatt(HTML) 7 Page - InnovASIC, Inc

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IA6805E2
29 August 2007
Microprocessor Unit
As of Production Version 00
Functional Description
Memory:
The MPU is capable of addressing 8192 bytes of memory and I/O registers. The locations
are divided into internal memory space and external memory space as shown in Figure 5.
The first 128 bytes of memory contain internal port I/O locations, timer locations, and 112
bytes of RAM. The MPU can read from or write to any of these locations. During program
reads from on chip locations, the MPU accepts data only from the addressed on chip
location. Any read data appearing on the input bus is ignored. The shared stack area is used
during interrupts or subroutine calls. A maximum of 64 bytes of RAM is available for stack
usage. The stack pointer is set to $7f at power up. The unused bytes of the stack can be used
for data storage or temporary work locations, but care must be taken to prevent it from
being overwritten due to stacking from an interrupt or subroutine call.
RAM
(112 BYTES)
I/O PORTS
TIMER RAM
EXTERNAL MEMORY
SPACE (8064 BYTES)
TIMER INTERRUPT FROM WAIT STATE ONLY
TIMER INTERRUPT
EXTERNAL INTERRUPT
SWI
RESET
PORT A DATA REGISTER
PORT B DATA REGISTER
EXTERNAL MEMORY SPACE
EXTERNAL MEMORY SPACE
PORT A DATA DIRECTION REGISTER
PORT B DATA DIRECTION REGISTER
EXTERNAL MEMORY SPACE
EXTERNAL MEMORY SPACE
TIMER DATA REGISTER
TIMER CONTROL REGISTER
EXTERNAL MEMORY SPACE
$1FF6 - $1FF7
$1FF8 - $1FF9
$1FFA - $1FFB
$1FFC - $1FFD
$1FFE - $1FFF
$0000
$007F
$0080
$00FF
$0100
63
64
127
0
127
128
255
256
8191
INTERRUPT
VECTORS
ACCESS VIA
PAGE 0
DIRECT
ADDRESS
STACK
(64 BYTES MAX)
0
1
2
3
4
5
6
7
8
9
10
15
16
Figure 5. Memory Map
Copyright © 2007
IA211081401-03
www.Innovasic.com
Customer Support:
Page 7 of 33
1-888-824-4184
©


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