68HC05CL48 datasheet(29/145 Pages) MOTOROLA

tên linh kiện	68HC05CL48

Giải thích chi tiết về linh kiện	SPECIFICATION (General Release)

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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

HALF CARRY

INTERRUPT MASK

NEGATIVE

ZERO

CARRY

543210

13 12

ACCUMULATOR

INDEX REGISTER

STACK POINTER

CONDITION CODE REGISTER

00000

011

PROGRAM COUNTER

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