MC68HC000CRC8 Freescale Semiconductor, MC68HC000CRC8 Datasheet - Page 90

no-image

MC68HC000CRC8

Manufacturer Part Number
MC68HC000CRC8
Description
IC MPU 32BIT 8MHZ 68-PGA
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC68HC000CRC8

Processor Type
M680x0 32-Bit
Speed
8MHz
Voltage
3.3V, 5V
Mounting Type
Surface Mount
Package / Case
68-PGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
The actual address on the address bus is truncated to the number of address bits
available on the bus of the particular implementation of the M68000 architecture. In all
processors except the MC68008, this is 24 address bits. (A0 is implicitly encoded in the
data strobes.) In the MC68008, the address is 20 or 22 bits in length. The memory map for
exception vectors is shown in Table 6-2.
The vector table, Table 6-2, is 512 words long (1024 bytes), starting at address 0
(decimal) and proceeding through address 1023 (decimal). The vector table provides 255
unique vectors, some of which are reserved for trap and other system function vectors. Of
the 255, 192 are reserved for user interrupt vectors. However, the first 64 entries are not
protected, so user interrupt vectors may overlap at the discretion of the systems designer.
6.2.2 Kinds of Exceptions
Exceptions can be generated by either internal or external causes. The externally
generated exceptions are the interrupts, the bus error, and reset. The interrupts are
MOTOROLA
Where:
D15
A31
v7 is the MSB of the vector number
v0 is the LSB of the vector number
31
31
(MC68000, MC68HC000, MC68HC001, MC68EC000, and MC68008)
Figure 6-4. Exception Vector Address Calculation (MC68010)
ALL ZEROES
Figure 6-3. Address Translated from 8-Bit Vector Number
M68000 8-/16-/32-BIT MICROPROCESSORS USER’S MANUAL
ALL ZEROES
IGNORED
Figure 6-2. Peripheral Vector Number Format
Freescale Semiconductor, Inc.
For More Information On This Product,
CONTENTS OF VECTOR BASE REGISTER
A10
Go to: www.freescale.com
A9
v7
10
D8
A8
v6
v7
D7
v7
A7
v5
v6
v5
v6
A6
v4
v4
v3
v5
A5
v3
v2
v4
A4
v2
v1
v0
v3
A3
v1
0
0
EXCEPTION VECTOR
v2
A2
v0
0
0
ADDRESS
v1
A1
+
0
D0
v0
A0
0
6- 5

Related parts for MC68HC000CRC8