68HC05PL4 datasheet(21/98 Pages) FREESCALE

部件名	68HC05PL4

功能描述	Industry standard 8-bit M68HC05 CPU core

PDF	98 Pages

Scroll/Zoom	100%

制造商	FREESCALE [Freescale Semiconductor, Inc]

网页	http://www.freescale.com

标志

21 / 98 page

April 30, 1998

GENERAL RELEASE SPECIFICATION

MC68HC05PL4

CENTRAL PROCESSING UNIT

REV 2.0

3-1

SECTION 3

CENTRAL PROCESSING UNIT

The MC68HC05PL4 has an 8k-bytes memory map. 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 v e 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

CONDITION CODE REGISTER

ACCUMULATOR

INDEX REGISTER

STACK POINTER

111

PROGRAM COUNTER

NZC

HALF-CARRY BIT (FROM BIT 3)

INTERRUPT MASK

NEGATIVE BIT

ZERO BIT

CARRY BIT

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68HC05PL4 数据表(PDF) 21 Page - Freescale Semiconductor, Inc