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68HC05CL48 Datasheet(PDF) 29 Page - Motorola, Inc

Part # 68HC05CL48
Description  SPECIFICATION (General Release)
PDF  145 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

68HC05CL48 Datasheet(HTML) 29 Page - Motorola, Inc

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June 11, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL48
CPU
MOTOROLA
REV 2.0
3-1
SECTION 3
CPU
The MC68HC05CL48 has an 64k memory map. Therefore it uses all 16 bits of the
address bus. The stack has only 64 bytes. Therefore, the stack pointer has been
reduced to only 6 bits and will only decrement down to $00C0 and then wrap-
around to $00FF. All other instructions and registers behave as described in this
chapter.
3.1
REGISTERS
The MCU contains five registers which are hard-wired within the CPU and are not
part of the memory map. These five registers are shown in Figure 3-1 and are
described in the following paragraphs.
Figure 3-1. MC68HC05 Programming Model
3.1.1 Accumulator (A)
The accumulator is a general purpose 8-bit register as shown in Figure 3-1. The
CPU uses the accumulator to hold operands and results of arithmetic calculations
A
X
SP
PC
CC
HALF CARRY
INTERRUPT MASK
NEGATIVE
ZERO
CARRY
76
543210
15
14
13 12
11
10
9
8
ACCUMULATOR
INDEX REGISTER
STACK POINTER
CONDITION CODE REGISTER
00000
0
011
0
HI
N
Z
C
1
1
1
PROGRAM COUNTER



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