PIC18F452-E/ML Microchip Technology, PIC18F452-E/ML Datasheet - Page 7

• Manufacturer Part Number: PIC18F452-E/ML
• Description: 44 PIN, 32KB ENH FLASH, 1536 RAM, 34 I/O,
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F452-E/ML

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• 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 opera-
tion. Once the erase has started (falling edge of the 4th
SCLK after the WRITE 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 Figure 3-2 and the flowchart is show in Figure 3-1.
FIGURE 3-2:
 2010 Microchip Technology Inc.
Chip Erase
Erase Data EEPROM
Erase Boot Block
Erase Panel 1
Erase Panel 2
Erase Panel 3
Erase Panel 4
SCLK
SDATA
Note:
DEVICE PROGRAMMING
High Voltage ICSP Bulk Erase
4-bit Command
1
A bulk erase is the only way to reprogram
code protect bits from an on state to an off
state.
0
2
Description
0
3
1
BULK ERASE OPTIONS
4
1
BULK ERASE TIMING
P5
1
0
Data Payload
2
0
16-bit
15 16
0
0
P5A
4-bit Command
1
0
Data
80h
81h
83h
88h
89h
8Ah
8Bh
2
0
3
0
SDATA = Input
4
0
P5
1
0
2
0
TABLE 3-2:
FIGURE 3-1:
NOP
Command
0000
0000
0000
0000
0000
0000
1100
0000
0000
4-Bit
15 16
0
0
P5A
4-bit Command
PIC18FXX2/XX8
Payload
1
0
0E 3C
6E F8
0E 00
6E F7
0E 04
6E F6
00 80
00 00
00 00
Data
2
0
Delay P11+P10
BULK ERASE COMMAND
SEQUENCE
Load Address
Entire Device
3
0
Pointer to
Write 80h
3C0004h
to Erase
4
BULK ERASE FLOW
Done
Time
0
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
Core Instruction
P11
DS39576C-page 7
Data Payload
P10
16-bit
1
n
2
n