參數(shù)資料
型號: MC68HC05CL48
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 1.802 MHz, MICROCONTROLLER, PQFP112
封裝: TQFP-112
文件頁數(shù): 68/145頁
文件大?。?/td> 673K
代理商: MC68HC05CL48
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 ve registers which are hard-wired within the CPU and are not
part of the memory map. These ve 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
PROGRAM COUNTER
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