PIC16F628-04I/SO Microchip Technology, PIC16F628-04I/SO Datasheet - Page 44
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PIC16F628-04I/SO
Manufacturer Part Number
PIC16F628-04I/SO
Description
IC MCU FLASH 2KX14 COMP 18SOIC
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Datasheet
1.PIC16F627-04P.pdf
(170 pages)
Specifications of PIC16F628-04I/SO
Program Memory Type
FLASH
Program Memory Size
3.5KB (2K x 14)
Package / Case
18-SOIC (7.5mm Width)
Core Processor
PIC
Core Size
8-Bit
Speed
4MHz
Connectivity
UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
16
Eeprom Size
128 x 8
Ram Size
224 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
PIC16F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
224 B
Interface Type
SCI/USART
Maximum Clock Frequency
4 MHz
Number Of Programmable I/os
16
Number Of Timers
3
Operating Supply Voltage
3 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163014, DM164120-4
Minimum Operating Temperature
- 40 C
Data Rom Size
128 B
Height
2.31 mm
Length
11.53 mm
Supply Voltage (max)
5.5 V
Supply Voltage (min)
3 V
Width
7.49 mm
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
XLT18SO-1 - SOCKET TRANSITION 18SOIC 300MILAC164010 - MODULE SKT PROMATEII DIP/SOIC
Data Converters
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
PIC16F628-04I/SOR
PIC16F628-04I/SOR
PIC16F628-04I/SOR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
PIC16F628-04I/SO
Manufacturer:
MIC
Quantity:
20 000
PIC16F62X
5.3
5.3.1
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 Bit 5
of PORTB will cause all eight bits of PORTB to be read
into the CPU. Then the BSF operation takes place on
Bit 5 and PORTB is written to the output latches. If
another bit of PORTB is used as a bi-directional I/O pin
(e.g., 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.
Reading a 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
(ex. 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 5-2 shows the effect of two sequential read-
modify-write instructions (ex., 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.
FIGURE 5-16:
DS40300C-page 42
Note
I/O Programming Considerations
1:
2:
BI-DIRECTIONAL I/O PORTS
This example shows write to PORTB followed by a read from PORTB.
Data setup time = (0.25 T
Therefore, at higher clock frequencies, a write followed by a read may be problematic.
Instruction
fetched
SUCCESSIVE I/O OPERATION
PC
Q1 Q2 Q3 Q4
MOWF PORTB
Write to PORTB
PC
CY
- T
PD
) where T
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
MOWF PORTB, W
Read to PORTB
CY
Execute
MOVWF
PORTB
PC + 1
Preliminary
= instruction cycle and T
T
PD
EXAMPLE 5-2:
;Initial PORT settings:PORTB<7:4> Inputs
;
;
;PORTB<7:6> have external pull-up and are not
;connected to other circuitry
;
;
;
;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).
5.3.2
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-
16). 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 be such
to allow the pin voltage to stabilize (load dependent)
before the next instruction which causes that file to be
read into the CPU is executed. 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.
Port pin
sampled here
BCF STATUS, RP0
BCF PORTB, 7
BSF STATUS, RP0
BCF TRISB, 7
BCF TRISB, 6
PC + 2
Execute
MOVWF
PORTB
PD
NOP
= propagation delay of Q1 cycle to output valid.
SUCCESSIVE OPERATIONS ON I/O
PORTS
Execute
PC + 3
READ-MODIFY-WRITE
INSTRUCTIONS ON AN
I/O PORT
NOP
NOP
2003 Microchip Technology Inc.
PORT latchPORT Pins
---------- ----------
;
;01pp pppp 11pp pppp
;
;10pp pppp 11pp pppp
;10pp pppp 10pp pppp
PORTB<3:0> Outputs