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| 型號： | PIC16C432-E/P |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 17/70頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU CMOS 8-BIT 20MHZ 2K 20DIP |
| 標(biāo)準(zhǔn)包裝： | 25 |
| 系列： | PIC® 16C |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 20MHz |
| 連通性： | LIN（本地互連網(wǎng)絡(luò)） |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，POR，WDT |
| 輸入/輸出數(shù)： | 12 |
| 程序存儲(chǔ)器容量： | 3.5KB（2K x 14） |
| 程序存儲(chǔ)器類型： | OTP |
| RAM 容量： | 128 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振蕩器型： | 外部 |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 20-DIP（0.300"，7.62mm） |
| 包裝： | 管件 |
| 配用： | AC164029-ND - MODULE SKT PROMATEII 20DIP/SSOP DVA16XP201-ND - ADAPTER DEVICE FOR MPLAB-ICE |
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PIC16C432
DS41140B-page 22
Preliminary
2002 Microchip Technology Inc.
4.3
I/O Programming Considerations
4.3.1
BI-DIRECTIONAL I/O PORTS
Any instruction which writes, operates internally as a
read followed by a write operation. The BCF and BSF
instructions, for example, read the register into the
CPU, execute the bit operation and write the result
back to the register. Caution must be used when these
instructions are applied to a port with both inputs and
outputs defined. For example, a BSF operation on bit5
of PORTB will cause all eight bits of PORTB to be read
into the CPU. Then the BSF operation takes place on
bit5 and PORTB is written to the output latches. If
another bit of PORTB is used as a bi-directional I/O pin
(i.e., bit0) and it is defined as an input at this time, the
input signal present on the pin itself would be read into
the CPU and re-written to the data latch of this
particular pin, overwriting the previous content. As long
as the pin stays in the Input mode, no problem occurs.
However, if bit0 is switched into Output mode later on,
the content of the data latch may now be unknown.
Reading the port register, reads the values of the port
pins. Writing to the port register writes the value to the
port latch. When using read-modify-write instructions
(i.e., BCF, BSF, etc.) on a port, the value of the port
pins is read, the desired operation is done to this value,
and this value is then written to the port latch.
Example 4-2 shows the effect of two sequential read-
modify-write instructions (i.e., BCF, BSF, etc.) on an
I/O port.
A pin actively outputting a Low or High should not be
driven from external devices at the same time, in order
to change the level on this pin (“wired-or”, “wired-and”).
The resulting high output currents may damage
the chip.
EXAMPLE 4-2:
READ-MODIFY-WRITE
INSTRUCTIONS ON AN
I/O PORT
4.3.2
SUCCESSIVE OPERATIONS ON I/O
PORTS
The actual write to an I/O port happens at the end of an
instruction cycle, whereas for reading, the data must be
valid at the beginning of the instruction cycle (Figure 4-
7). Therefore, care must be exercised if a write followed
by a read operation is carried out on the same I/O port.
The sequence of instructions should allow the pin volt-
age to stabilize (load dependent) before the next
instruction causes that file to be read into the CPU.
Otherwise, the previous state of that pin may be read
into the CPU, rather than the new state. When in doubt,
it is better to separate these instructions with a NOP, or
another instruction not accessing this I/O port.
FIGURE 4-7:
SUCCESSIVE I/O OPERATION
; Initial PORT settings:
PORTB<7:4> Inputs
PORTB<3:0> Outputs
; PORTB<7:6> have external pull-up and are not connected
; to other circuitry
;
PORT latch
PORT pins
;
------------------
----------------
BCF PORTB, 7
; 01pp pppp
11pp pppp
BCF PORTB, 6
;10pp pppp
11pp pppp
BSF STATUS,
RP0
;
BCF TRISB, 7
; 10pp pppp
11pp pppp
BCF TRISB, 6
; 10pp pppp
10pp pppp
;
; NOTE: that the user may have expected the pin values to
; be 00pp pppp. The 2nd BCF caused RB7 to be latched as
; the pin value (High).
Note:
This example shows write to PORTB
followed by a read from PORTB.
Note that:
data setup time = (0.25 TCY - TPD)
where TCY = instruction cycle and
TPD = propagation delay of Q1 cycle
to output valid.
Therefore, at higher clock frequencies,
a write followed by a read may be
problematic.
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
RB <7:0>
Port pin
sampled here
PC
PC + 1
PC + 2
PC + 3
NOP
MOVF PORTB, W
Read PORTB
MOVWF PORTB
Write to
PORTB
PC
Instruction
fetched
T PD
Execute
MOVWF
PORTB
Execute
MOVF
PORTB, W
Execute
NOP
RB<7:0>
PC
Instruction
Fetched
MOVWF PORTB
MOVF PORTB, W
NOP
Execute
MOVWF
PORTB
Execute
MOVF
PORTB, W
Execute
NOP
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| PIC16C432-I/P | 功能描述:8位微控制器 -MCU 20MHz 2K EPROM 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 |
| PIC16C432-I/SS | 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 12 I/O 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 |
| PIC16C432T-E/SS | 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 12 I/O 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 |
| PIC16C432T-I/SS | 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 12 I/O 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 |
| PIC16C433/JW | 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 6 I/O 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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