參數(shù)資料
型號: MC68HC05J5AJDWR2
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO16
封裝: SOIC-16
文件頁數(shù): 20/106頁
文件大小: 1069K
代理商: MC68HC05J5AJDWR2
GENERAL RELEASE SPECIFICATION
July 16, 1999
MOTOROLA
MEMORY
MC68HC05J5A
2-2
REV 2.1
2.1
I/O AND CONTROL REGISTERS
The I/O and Control Registers reside in locations $0000-$001F. The overall orga-
nization of these registers is shown in Figure 2-2. The bit assignments for each
register are shown in Figure 2-3 and Figure 2-4. Reading from unimplemented
bits will return unknown states, and writing to unimplemented bits will be ignored.
Figure 2-2. I/O Registers Memory Map
2.2
RAM
The total RAM consists of 128 bytes (including the stack) at locations $0080
through $00FF. The stack begins at address $00FF and proceeds down to $00C0.
Using the stack area for data storage or temporary work locations requires care to
prevent it from being overwritten due to stacking from an interrupt or subroutine
call.
2.3
ROM
There are a total of 2570 bytes of user ROM on-chip. This includes 2560 bytes of
user ROM from locations $0300 to $0CFF for user program storage and 10 bytes
for user vectors from locations $0FF6 to $0FFF.
Port A Data Register
$0000
Port B Data Register
$0001
Port A Data Direction Register
$0004
Port B Data Direction Register
$0005
MFT Control & Status Register
$0008
MFT Counter Register
$0009
Reserved for Test
$001F
unimplemented (2)
unimplemented (5)
IRQ Control & Status Register
$000A
Port A Pulldown/up Register
$0010
Port B Pulldown/up Register
$0011
unimplemented (1)
$0002
$0003
unimplemented (2)
Timer1 Registers (4)
$0012
$0015
unimplemented (3)
Timer1 Registers (4)
$0018
$001B
$001E
Reserved
Timer1 Capture Control Register
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