PIC16F1507-I/ML Microchip Technology, PIC16F1507-I/ML Datasheet - Page 31

• Manufacturer Part Number: PIC16F1507-I/ML
• Description: 3.5KB Flash, 128B RAM, 18 I/O, CLC, CWG, DDS, 10-bit ADC 20 QFN 4x4mm TUBE
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F1507-I/ML

• Processor Series: PIC16
• Core: PIC16F
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 3.5 KB
• Data Ram Size: 128 B
• Interface Type: ICSP
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 18
• Number Of Timers: 3
• Operating Supply Voltage: 2.3 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-20
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Supply Current (max): 30 uA
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: -
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Eeprom Size: -
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.3 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / Rohs Status: Details

7.3.2
With the program code protection enabled, the
checksum is computed in the following manner: The
Least Significant nibble of each user ID is used to
create a 16-bit value. The masked value of user ID
location 8000h is the Most Significant nibble. This sum
of user IDs is summed with the Configuration Words (all
unimplemented Configuration bits are masked to ‘0’).
EXAMPLE 7-3:
 2011 Microchip Technology Inc.
Note 1:
PIC16F1507
2:
3:
4:
5:
6:
7:
PROGRAM CODE PROTECTION
ENABLED
This value is obtained by making all bits of the Configuration Word 1 a ‘1’, but the code-protect bit is ‘0’
(thus, enabled), then converting it to hex, thus having a value of 3F7Fh.
This value is obtained by making all used bits of the Configuration Word 1 a ‘1’, but the code-protect bit
is ‘0’ (thus, enabled), then converting it to hex, thus having a value of 0E7Bh.
This value is obtained by making all bits of the Configuration Word 2 a ‘1’, then converting it to hex, thus
having a value of 3FFFh.
This value is obtained by making all used bits of the Configuration Word 2 a ‘1’, then converting it to hex,
thus having a value of 2E03h.
These values are picked at random for this example; they could be any 16-bit value.
In order to calculate the sum of user IDs, take the 16-bit value of the first user ID location (0006h), AND
the address to (000Fh), thus masking the MSB. This gives you the value 0006h, then shift left 12 bits,
giving you 6000h. Do the same procedure for the 16-bit value of the second user ID location (0007h),
except shift left 8 bits. Also, do the same for the third user ID location (0001h), except shift left 4 bits. For
the fourth user ID location do not shift. Finally, add up all four user ID values to get the final sum of user
IDs of 6712h.
This value is obtained by ANDing the Configuration Word value with the Configuration Word Mask Value
and adding it to the sum of user IDs: (3F7Fh AND 0E7Bh) + (3FFFh AND 2E03h) + 6712h = A390h.
Configuration Word 2 mask
User ID (8000h)
User ID (8001h)
User ID (8002h)
User ID (8003h)
Sum of User IDs = (0006h and 000Fh) << 12 + (0007h and 000Fh) << 8 +
Configuration Word 1
Configuration Word 1 mask
Configuration Word 2
Checksum
CHECKSUM COMPUTED WITH PROGRAM CODE PROTECTION ENABLED
(CP = 0), PIC16F1507, BLANK DEVICE
PIC12(L)F1501/PIC16(L)F150X
= (3F7Fh and 0E7Bh) + (3FFFh and 2E03h) + Sum of User IDs
= 6000h + 0700h + 0010h + 0002h
= 6712h
= A390h
= 0E7Bh +2E03h + 6712h
(0001h and 000Fh) << 4 + (0002h and 000Fh)
Advance Information
3F7Fh
0E7Bh
3FFFh
2E03h
0006h
0007h
0001h
0002h
(5)
(5)
(5)
(5)
(1)
(4)
(2)
(3)
(6)
DS41573C-page 31
(7)