PIC16LF74-I/PTG Microchip Technology, PIC16LF74-I/PTG Datasheet - Page 105
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PIC16LF74-I/PTG
Manufacturer Part Number
PIC16LF74-I/PTG
Description
IC MCU FLASH 4KX14 44TQFP
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Specifications of PIC16LF74-I/PTG
Core Processor
PIC
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
33
Program Memory Size
7KB (4K x 14)
Program Memory Type
FLASH
Ram Size
192 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16LF74-I/PTG
Manufacturer:
Microchip Technology
Quantity:
10 000
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FIGURE 12-12:
12.15 Program Verification/Code
If the code protection bit(s) have not been pro-
grammed, the on-chip program memory can be read
out for verification purposes.
12.16 ID Locations
Four memory locations (2000h - 2003h) are designated
as ID locations, where the user can store checksum or
other code identification numbers. These locations are
not accessible during normal execution, but are read-
able and writable during program/verify. It is recom-
mended that only the 4 Least Significant bits of the ID
location are used.
12.17 In-Circuit Serial Programming
PIC16F7X microcontrollers can be serially pro-
grammed while in the end application circuit. This is
simply done, with two lines for clock and data and three
other lines for power, ground, and the programming
voltage (see Figure 12-13 for an example). This allows
customers to manufacture boards with unprogrammed
devices, and then program the microcontroller just
before shipping the product. This also allows the most
recent firmware or a custom firmware to be pro-
grammed.
2002 Microchip Technology Inc.
Note
OSC1
CLKOUT
INT pin
INTF Flag
(INTCON<1>)
GIE bit
(INTCON<7>)
INSTRUCTION FLOW
Instruction
Fetched
Instruction
Executed
1:
2:
3:
4:
Protection
(4)
PC
XT, HS or LP oscillator mode assumed.
T
GIE = ’1’ assumed. In this case after wake- up, the processor jumps to the interrupt routine.
If GIE = ’0’, execution will continue in-line.
CLKOUT is not available in these osc modes, but shown here for timing reference.
OST
Inst(PC) = SLEEP
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
= 1024 T
Inst(PC - 1)
PC
WAKE-UP FROM SLEEP THROUGH INTERRUPT
OSC
(drawing not to scale) This delay will not be there for RC osc mode.
Inst(PC + 1)
SLEEP
PC+1
Processor in
SLEEP
PC+2
T
OST
(2)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
Inst(PC + 2)
Inst(PC + 1)
For general information of serial programming, please
refer to the In-Circuit Serial Programming (ICSP™)
Guide (DS30277). For specific details on programming
commands and operations for the PIC16F7X devices,
please refer to the latest version of the PIC16F7X
FLASH Program Memory Programming Specification
(DS30324).
FIGURE 12-13:
PC+2
* Isolation devices (as required).
External
Connector
Signals
Data I/O
CLK
+5V
V
0V
PP
Interrupt Latency
Dummy cycle
(Note 2)
PC + 2
*
To Normal
Connections
To Normal
Connections
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING
CONNECTION
*
Inst(0004h)
Dummy cycle
0004h
PIC16F7X
*
*
DS30325B-page 103
V
V
MCLR/V
RB6
RB7
DD
SS
PIC16F7X
Inst(0005h)
Inst(0004h)
0005h
V
PP
DD
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