MC68HC000RC10 Freescale Semiconductor, MC68HC000RC10 Datasheet - Page 20

• Manufacturer Part Number: MC68HC000RC10
• Description: IC MPU 32BIT 10MHZ 68-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC000RC10

• Processor Type: M680x0 32-Bit
• Speed: 10MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

When a data register is used as either a source or a destination operand, only the
appropriate low-order portion is changed; the remaining high-order portion is neither
used nor changed.
2.3.2 Address Registers
Each address register (and the stack pointer) is 32 bits wide and holds a full, 32-bit
address. Address registers do not support byte-sized operands. Therefore, when an
address register is used as a source operand, either the low-order word or the entire
long-word operand is used, depending upon the operation size. When an address
register is used as the destination operand, the entire register is affected, regardless of
the operation size. If the operation size is word, operands are sign-extended to 32 bits
before the operation is performed.
2.4
Bytes are individually addressable. As shown in Figure 2-5, the high-order byte of a
word has the same address as the word. The low-order byte has an odd address, one
count higher. Instructions and multibyte data are accessed only on word (even byte)
boundaries. If a long-word operand is located at address n (n even), then the second
word of that operand is located at address n+2.
The data types supported by the M68000 MPUs are bit data, integer data of 8, 16, and
32 bits, 32-bit addresses, and binary-coded-decimal data. Each data type is stored in
memory as shown in Figure 2-6. The numbers indicate the order of accessing the data
from the processor. For the MC68008 with its 8-bit bus, the appearance of data in
memory is identical to the all the M68000 MPUs. The organization of data in the memory
of the MC68008 is shown in Figure 2-7.
2-6
DATA ORGANIZATION IN MEMORY
ADDRESS
$FFFFFE
$000002
$000000
15
M68000 8-/16-/32-BIT MICROPROCESSOR USER’S MANUAL
14
Figure 2-5. Word Organization in Memory
Freescale Semiconductor, Inc.
13
BYTE FFFFFE
For More Information On This Product,
BYTE 000000
BYTE 000002
12
11
Go to: www.freescale.com
10
9
WORD 7FFFFF
WORD 0
WORD 1
8
7
6
5
BYTE 000001
BYTE 000003
BYTE FFFFFE
4
3
2
1
0
MOTOROLA