PIC18F4431-E/ML Microchip Technology, PIC18F4431-E/ML Datasheet - Page 9

• Manufacturer Part Number: PIC18F4431-E/ML
• Description: IC MCU FLASH 8KX16 44QFN
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4431-E/ML

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 9x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.0
3.1
Erasing code or data EEPROM is accomplished by
writing an “erase option” to address 3C0004h. Code
memory may be erased portions at a time, or the user
may erase the entire device in one action. “Bulk Erase”
operations will also clear any code protect settings
associated with the memory block erased. Erase
options are detailed in Table 3-1.
TABLE 3-1:
The actual bulk erase function is a self-timed operation.
Once the erase has started (falling edge of the 4th
SCLK after the NOP command), serial execution will
cease until the erase completes (parameter P11). Dur-
ing this time, SCLK may continue to toggle but SDATA
must be held low.
The code sequence to erase the entire device is shown
in Table 3-2 and the flowchart is shown in Figure 3-1.
FIGURE 3-2:
 2010 Microchip Technology Inc.
Chip Erase
Erase Data EEPROM
Erase Boot Block
Erase Block 1
Erase Block 2
Erase Block 3
Erase Block 4
SCLK
SDATA
Note:
4-bit Command
DEVICE PROGRAMMING
High Voltage ICSP Bulk Erase
1
0
A bulk erase is the only way to reprogram
code protect bits from an on-state to an
off-state.
Non-code protect bits are not returned to
default settings by a bulk erase. These bits
should be programmed to ones, as out-
lined in Section 3.6, “Configuration Bits
Programming”.
2
0
Description
3
1
BULK ERASE OPTIONS
4
1
P5
BULK ERASE TIMING
1
0
Data Payload
2
0
16-bit
15 16
0
0
P5A
4-bit Command
1
0
PIC18F2331/2431/4331/4431
Data
80h
81h
83h
88h
89h
8Ah
8Bh
2
0
3
0
SDATA = Input
4
0
P5
1
0
Data Payload
2
0
16-bit
TABLE 3-2:
FIGURE 3-1:
Command
15 16
0
0000
0000
0000
0000
0000
0000
1100
0000
0000
4-Bit
0
P5A
4-bit Command
1
0
Payload
0E 3C
6E F8
0E 00
6E F7
0E 04
6E F6
00 80
00 00
00 00
2
Data
0
Delay P11+P10
BULK ERASE COMMAND
SEQUENCE
3
0
Load Address
Entire Device
Pointer to
Write 80h
3C0004h
to Erase
4
0
BULK ERASE FLOW
Done
Time
Start
MOVLW 3Ch
MOVWF TBLPTRU
MOVLW 00h
MOVWF TBLPTRH
MOVLW 04h
MOVWF TBLPTRL
Write 80h TO 3C0004h to
erase entire device.
NOP
Hold SDATA low until
erase completes.
Erase Time
P11
Core Instruction
DS30500B-page 9
P10
Data Payload
16-bit
1
n
2
n