參數(shù)資料
型號(hào)： PIC16C505-04
廠商： Microchip Technology Inc.
元件分類： 8位微控制器
英文描述： 14-Pin, 8-Bit CMOS Microcontroller
中文描述： 14引腳，8位CMOS微控制器
文件頁(yè)數(shù)： 19/84頁(yè)
文件大?。?/td> 449K
代理商： PIC16C505-04
1998 Microchip Technology Inc.
Preliminary
DS40192B-page 19
PIC16C505
5.0
I/O PORT
As with any other register, the I/O register can be
written and read under program control. However, read
instructions (e.g.,
MOVF PORTB,W
) always read the I/
O pins independent of the pin’s input/output modes.
On RESET, all I/O ports are defined as input (inputs
are at hi-impedance) since the I/O control registers are
all set.
5.1
PORTB
PORTB is an 8-bit I/O register. Only the low order 6
bits are used (RB5:RB0). Bits 7 and 6 are
unimplemented and read as '0's. Please note that RB3
is an input only pin. The configuration word can set
several I/O’s to alternate functions. When acting as
alternate functions the pins will read as ‘0’ during port
read. Pins RB0, RB1, RB3 and RB4 can be configured
with weak pull-ups and also with wake-up on change.
The wake-up on change and weak pull-up functions
are not pin selectable. If pin 4 is configured as MCLR,
weak pull-up is always off and wake-up on change for
this pin is not enabled.
5.2
PORTC
PORTC is an 8-bit I/O register. Only the low order 6 bits
are used (RC5:RC0). Bits 7 and 6 are unimplemented
and read as ‘0’s.
5.3
TRIS Registers
The output driver control register is loaded with the
contents of the W register by executing the
TRIS
f
instruction. A '1' from a TRIS register bit puts the
corresponding output driver in a hi-impedance mode.
A '0' puts the contents of the output data latch on the
selected pins, enabling the output buffer. The
exceptions are RB3 which is input only and RC5 which
may be controlled by the option register, see Figure 4-
4.
The TRIS registers are “write-only” and are set (output
drivers disabled) upon RESET.
Note:
A read of the ports reads the pins, not the
output data latches. That is, if an output
driver on a pin is enabled and driven high,
but the external system is holding it low, a
read of the port will indicate that the pin is
low.
5.4
I/O Interfacing
The equivalent circuit for an I/O port pin is shown in
Figure 5-1. All port pins, except RB3 which is input
only, may be used for both input and output operations.
For input operations these ports are non-latching. Any
input must be present until read by an input instruction
(e.g.,
MOVF PORTB,W
). The outputs are latched and
remain unchanged until the output latch is rewritten. To
use a port pin as output, the corresponding direction
control bit in TRIS must be cleared (= 0). For use as an
input, the corresponding TRIS bit must be set. Any I/O
pin (except RB3) can be programmed individually as
input or output.
FIGURE 5-1:
EQUIVALENT CIRCUIT
FOR A SINGLE I/O PIN
Data
Bus
Q
D
Q
CK
Q
D
Q
CK
P
N
WR
Port
TRIS ‘f’
Data
Latch
TRIS
Latch
RD Port
V
SS
V
DD
I/O
pin
(1)
W
Reg
Reset
Note 1:
I/O pins have protection diodes to V
DD
and V
SS
.
Note 2:
See Table 3-1 for buffer type.
(2)
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PIC16CR54B EPROM/ROM-Based 8-Bit CMOS Microcontroller Series(每個(gè)I/O口有20mA吸收,25mA驅(qū)動(dòng),12個(gè)I/O，2.5V的微控制器)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16C505-04/P 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz PDIP14 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16C505-04/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU (TUBE 30) 16C505 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C505 DIP14
PIC16C505-04/SL 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz SOIC14 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16C505-04/SL 制造商:Microchip Technology Inc 功能描述:8BIT CMOS MCU SMD 16C505 SOIC14
PIC16C505-04E/P 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz Ext Temp PDIP14 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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