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| 型號： | PIC10F220IOT |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 6-Pin, 8-Bit Flash Microcontrollers |
| 中文描述： | 6引腳，8位閃存微控制器 |
| 文件頁數(shù)： | 25/78頁 |
| 文件大小： | 583K |
| 代理商： | PIC10F220IOT |
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2006 Microchip Technology Inc.
Preliminary
DS41270B-page 23
PIC10F220/222
TABLE 5-3:
SUMMARY OF PORT REGISTERS
5.4
I/O Programming Considerations
5.4.1
BIDIRECTIONAL I/O PORTS
Some instructions operate internally as read followed
by write operations. The
BCF
and
BSF
instructions, for
example, read the entire port into the CPU, execute the
bit operation and re-write the result. Caution must be
used when these instructions are applied to a port
where one or more pins are used as input/outputs. For
example, a
BSF
operation on bit 2 of GPIO will cause
all eight bits of GPIO to be read into the CPU, bit 2 to
be set and the GPIO value to be written to the output
latches. If another bit of GPIO is used as a bidirectional
I/O pin (say bit 0) 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 rewritten 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 bit 0 is switched into Output mode later on,
the content of the data latch may now be unknown.
Example 5-1 shows the effect of two sequential
Read-Modify-Write instructions (e.g.,
BCF, BSF
, etc.)
on an I/O port.
A pin actively outputting a high or a low 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 5-1:
I/O PORT READ-MODIFY-
WRITE INSTRUCTIONS
5.4.2
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 5-5).
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 voltage 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 5-5:
SUCCESSIVE I/O OPERATION
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
Power-On
Reset
Value on
All Other Resets
N/A
TRISGPIO
—
—
—
—
I/O Control Registers
---- 1111
---- 1111
N/A
03h
06h
Legend:
OPTION
STATUS
GPIO
Shaded cells not used by Port registers, read as ‘
0
’, – = unimplemented, read as ‘
0
’,
x
= unknown,
u
= unchanged,
q
= depends on condition.
If Reset was due to wake-up on pin change, then bit 7 =
1
. All other Resets will cause bit 7 =
0
.
GPWU
GPWUF
—
GPPU
—
—
T0CS
—
—
T0SE
TO
—
PSA
PD
GP3
PS2
Z
GP2
PS1
DC
GP1
PS0
C
GP0
1111 1111
1111 1111
q00q quuu
(1)
0001 1xxx
---- xxxx
---- uuuu
Note
1:
;Initial GPIO Settings
;GPIO<3:2> Inputs
;GPIO<1:0> Outputs
;
;
;
BCF
GPIO, 1 ;---- pp01
BCF
GPIO, 0 ;---- pp10
MOVLW
007h;
TRIS
GPIO
;
Note:
The user may have expected the pin values to
be
---- pp00
. The second
BCF
caused GP1
to be latched as the pin value (High).
GPIO latch
----------
GPIO pins
----------
---- pp11
---- pp11
;---- pp10
---- pp11
PC
PC + 1
PC + 2
PC + 3
Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4 Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4
Instruction
Fetched
GP<2:0>
MOVWF
GPIO
NOP
Port pin
sampled here
NOP
MOVF
GPIO
,
W
Instruction
Executed
MOVWF GPIO
(Write to GPIO)
NOP
MOVF GPIO,W
(Read GPIO)
This example shows a write to GPIO followed
by a read from GPIO.
Data setup time = (0.25 T
CY
– T
PD
)
where: T
CY
= instruction cycle
T
PD
= propagation delay
Therefore, at higher clock frequencies, a
write followed by a read may be problematic.
Port pin
written here
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC10F220IP | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:6-Pin, 8-Bit Flash Microcontrollers |
| PIC10F220TE/MC | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D |
| PIC10F220T-E/MC | 制造商:Microchip Technology Inc 功能描述: |
| PIC10F220TE/OT | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D |
| PIC10F220T-E/OT | 功能描述:8位微控制器 -MCU 384 B FL 16 RAM 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 最大時鐘頻率:50 MHz 程序存儲器大小: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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