- 您现在的位置：买卖IC网 > PDF目录80462 > MC68HC11A0CP3 (FREESCALE SEMICONDUCTOR INC) 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDIP48 PDF资料下载
参数资料
| 型号： | MC68HC11A0CP3 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDIP48 |
| 封装： | PLASTIC, DIP-48 |
| 文件页数： | 92/158页 |
| 文件大小： | 3803K |
| 代理商： | MC68HC11A0CP3 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页当前第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页第128页第129页第130页第131页第132页第133页第134页第135页第136页第137页第138页第139页第140页第141页第142页第143页第144页第145页第146页第147页第148页第149页第150页第151页第152页第153页第154页第155页第156页第157页第158页
PARALLEL I/O
MOTOROLA
TECHNICAL DATA
4-1
4
4 PARALLEL I/O
The MC68HC11A8 has 40 I/O pins arranged as five 8-bit ports. All of these pins serve
multiple functions depending on the operating mode and data in the control registers.
This section explains the operation of these pins only when they are used for parallel
l/O.
Ports C and D are used as general purpose input and/or output pins under direct con-
trol of their respective data direction registers. Ports A, B, and E, with the exception of
port A pin 7, are fixed direction inputs or outputs and therefore do not have data direc-
tion registers. Port B, port C, the STRA pin, and the STRB pin are used for strobed
and/or handshake modes of parallel l/O, as well as general purpose l/O.
4.1 General-Purpose I/O (Ports C and D)
Each port l/O line has an associated bit in a specific port data register and port data
direction register. The data direction register bits are used to specify the primary direc-
tion of data for each l/O line. When an output line is read, the value at the input to the
pin driver is returned. When a line is configured as an input, that pin becomes a high-
impedance input. If a write is executed to an input line, the value does not affect the l/
O pin, but is stored in an internal latch. When the line becomes an output, this value
appears at the l/O pin. Data direction register bits are cleared by reset to configure l/
O pins as inputs.
The AS and R/W pins are dedicated to bus control while in the expanded multiplexed
operating modes, or parallel l/O strobes (STRA and STRB) while in the single chip op-
erating modes.
4.2 Fixed Direction I/O (Ports A, B, and E)
The lines for ports A, B, and E (except for port A bit 7) have fixed data directions. When
port A is being used for general purpose l/O, bits 0, 1, and 2 are configured as input
only and writes to these lines have no effect. Bits 3, 4, 5, and 6 of port A are configured
as output only and reads of these lines return the levels sensed at the input to the line
drivers. Port A bit 7 can be configured as either a general-purpose input or output us-
ing the DDRA7 bit in the pulse accumulator control register. When port B is being used
for general purpose output, it is configured as output only and reads of these lines will
return the levels sensed at the input of the pin drivers. Port E contains the eight A/D
channel inputs, but these lines may also be used as general purpose digital inputs.
Writes to the port E address have no effect.
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.
相关PDF资料 |
PDF描述 |
|---|---|
| MC68HC11E0CFU3 | 8-BIT, 3 MHz, MICROCONTROLLER, PQFP64 |
| MC68HC705C9AFS | 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER |
| MC68HC908GZ60CFA | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP48 |
| MC68HRC705J5ACDWR3 | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20 |
| MC68LNC705C9ACFN | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC44 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68HC11A0FB | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers |
| MC68HC11A0FB1 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers |
| MC68HC11A0FB3 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers |
| MC68HC11A0FB4 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers |
| MC68HC11A0FN | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers |
发布紧急采购，3分钟左右您将得到回复。