參數(shù)資料
型號: MC68HC711A0FB
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: ROM-based high-performance microcontrollers
中文描述: 基于ROM的高性能微控制器
文件頁數(shù): 63/124頁
文件大?。?/td> 840K
代理商: MC68HC711A0FB
PARALLEL I/O
TECHNICAL DATA
6-1
SECTION 6
PARALLEL I/O
The MC68HC11D3 has four 8-bit I/O ports; A, B, C, and D. In single-chip and bootstrap
modes, all ports are parallel I/O data ports. In expanded multiplexed and test modes,
ports B and C, and lines DATA6/AS and DATA7/R/W are a memory expansion bus
with port B as the high order address bus, port C as the multiplexed address and data
bus, AS as the demultiplexing signal, and R/W as the data bus direction control. Refer
to
Table 6-1
, which is a summary of the ports and their shared functions:
6.1 Port A
Port A bits handle the timer functions and can also be used as general-purpose I/O. In
both the normal operating modes, port A can be configured for four timer input capture
(IC) and three timer output compare (OC) functions, or four OC and three IC functions
with either a pulse accumulator input (PAI) or a fifth OC function.
*This pin is not bonded in the 40-pin version.
6.2 Port B
In single-chip mode, all port B pins are general-purpose I/O (PB[7:0]). In expanded
multiplexed mode, all port B pins act as high-order address bits (ADDR[15:8]).
Table 6-1 I/O Ports
Port
Port A
Port B
Port C
Port D
Input Pins
3
Output Pins
3
Bidirectional Pins
2
8
8
8
Shared Functions
TImer
High Order Address
Low Order Address and Data Bus
SCI, SPI, AS, and R/
PORTA
— Port A Data
$0000
Bit 7
PA7
HiZ
6
5
4
3
2
1
Bit 0
PA0
HiZ
PA6*
0
PA5
0
PA4*
0
PA3
HiZ
PA2
HiZ
PA1
HiZ
RESET:
Alt. Func:
PAI
OC1
OC2
OC1
OC3
OC1
OC4
OC1
IC4/OC5
OC1
IC1
IC2
IC3
And/or:
PORTB
— Port B Data
$0004
Bit 7
PB7
6
5
4
3
2
1
Bit 0
PB0
PB6
PB5
PB4
PB3
PB2
PB1
S. Chip
or Boot:
RESET:
Expan.
or Test:
RESET:
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
Reset configures pins as HiZ inputs
ADDR15
ADDR14
ADDR13
Reset configures pins as high-order address outputs
ADDR12
ADDR11
ADDR10
ADDR9
ADDR8
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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