PIC12C672-04/P Microchip Technology, PIC12C672-04/P Datasheet - Page 154
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PIC12C672-04/P
Manufacturer Part Number
PIC12C672-04/P
Description
IC MCU OTP 2KX14 A/D 8DIP
Manufacturer
Microchip Technology
Series
PIC® 12Cr
Datasheets
1.PIC16F688T-ISL.pdf
(688 pages)
2.PIC12CE673-10P.pdf
(129 pages)
3.PIC12CE673-10P.pdf
(14 pages)
Specifications of PIC12C672-04/P
Core Size
8-Bit
Program Memory Size
3.5KB (2K x 14)
Core Processor
PIC
Speed
4MHz
Peripherals
POR, WDT
Number Of I /o
5
Program Memory Type
OTP
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 4x8b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
8-DIP (0.300", 7.62mm)
Controller Family/series
PIC12
No. Of I/o's
6
Ram Memory Size
128Byte
Cpu Speed
4MHz
No. Of Timers
1
Digital Ic Case Style
DIP
Processor Series
PIC12C
Core
PIC
Data Bus Width
8 bit
Data Ram Size
128 B
Maximum Clock Frequency
4 MHz
Number Of Programmable I/os
5
Number Of Timers
8
Maximum Operating Temperature
+ 70 C
Mounting Style
Through Hole
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
ICE2000
Minimum Operating Temperature
0 C
On-chip Adc
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
ISPICR1 - ADAPTER IN-CIRCUIT PROGRAMMINGAC124001 - MODULE SKT PROMATEII 8DIP/SOIC
Eeprom Size
-
Connectivity
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
PIC12C672-04/P
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
- Current page: 154 of 688
- Download datasheet (3Mb)
PICmicro MID-RANGE MCU FAMILY
9.10
9.10.1
DS31009A-page 9-14
Bi-directional I/O Ports
I/O Programming Considerations
When using the ports (and GPIO) as I/O, design considerations need to be taken into account to
ensure that the operation is as intended.
Any instruction which performs a write operation actually does a read followed by a write opera-
tion. 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 (e.g., 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 rewritten to the data latch of this partic-
ular pin, overwriting the previous content. As long as the pin stays in the input mode, no problem
occurs. However, if bit0 is switched to an output, 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 (ex. BCF, BSF, etc.) on a port,
the value of the port pins is read, the desired operation is performed on this value, and the value
is then written to the port latch.
Example 9-9
Example 9-9: Read-Modify-Write Instructions on an I/O Port
A pin configured as an output, actively driving 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.
; Initial PORT settings: PORTB<7:4> Inputs
;
; PORTB<7:6> have external pull-ups and are not connected to other circuitry
;
;
;
;
; Note that the user may have expected the pin values to be 00pp ppp.
; The 2nd BCF caused RB7 to be latched as the pin value (high).
BCF
BCF
BSF
BCF
BCF
PORTB, 7
PORTB, 6
STATUS, RP0
TRISB, 7
TRISB, 6
shows the effect of two sequential read-modify-write instructions on an I/O port.
; 01pp pppp
; 10pp pppp
;
; 10pp pppp
; 10pp pppp
PORT latch
----------
PORTB<3:0> Outputs
PORT pins
---------
11pp pppp
11pp pppp
11pp pppp
10pp pppp
1997 Microchip Technology Inc.
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