PIC18F65K90T-I/PT Microchip Technology, PIC18F65K90T-I/PT Datasheet - Page 117

• Manufacturer Part Number: PIC18F65K90T-I/PT
• Description: 32kB Flash, 2kB RAM, 1kB EE, NanoWatt XLP, LCD 64 TQFP 10x10x1mm T/R
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F65K90T-I/PT

• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 32 KB
• Data Ram Size: 2 KB
• Interface Type: I2C, SPI
• Maximum Clock Frequency: 64 MHz
• Number Of Timers: 8
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 16 Channel
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 64MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 53
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 16x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP
• Lead Free Status / Rohs Status: Details

7.5
The programming block is 32 words or 64 bytes for
PIC18FX5K90
64 words or 128 bytes for PIC18FX7K90 devices.
Word or byte programming is not supported.
Table writes are used internally to load the holding
registers needed to program the Flash memory. There
are 64 holding registers for PIC18FX5K90 and
PIC18FX6K90 devices and 128 holding registers for
PIC18FX7K90 used by the table writes for programming.
Since the Table Latch (TABLAT) is only a single byte, the
TBLWT instruction may need to be executed 64 times for
each programming operation. All of the table write oper-
ations will essentially be short writes because only the
holding registers are written. At the end of updating the
64 or 128 holding registers, the EECON1 register must
be written to in order to start the programming operation
with a long write.
FIGURE 7-5:
7.5.1
The sequence of events for programming an internal
program memory location should be:
1.
2.
3.
4.
5.
6.
7.
8.
 2009-2011 Microchip Technology Inc.
TBLPTR = xxxxx0
Read the 64 or 128 bytes into RAM.
Update the data values in RAM as necessary.
Load the Table Pointer register with the address
being erased.
Execute the row erase procedure.
Load the Table Pointer register with the address
of the first byte being written.
Write the 64 or 128 bytes into the holding
registers with auto-increment.
Set the EECON1 register for the write operation:
• Set the EEPGD bit to point to program memory
• Clear the CFGS bit to access program memory
• Set WREN to enable byte writes
Disable the interrupts.
Writing to Flash Program Memory
FLASH PROGRAM MEMORY WRITE
SEQUENCE
Holding Register
and
8
TABLE WRITES TO FLASH PROGRAM MEMORY
PIC18FX6K90
TBLPTR = xxxxx1
devices,
Holding Register
8
and
Program Memory
TBLPTR = xxxxx2
Write Register
TABLAT
PIC18F87K90 FAMILY
The long write is necessary for programming the inter-
nal Flash. Instruction execution is halted while in a long
write cycle. The long write is terminated by the internal
programming timer.
The EEPROM on-chip timer controls the write time.
The write/erase voltages are generated by an on-chip
charge pump, rated to operate over the voltage range
of the device.
9.
10. Write 0xAA to EECON2.
11. Set the WR bit. This will begin the write cycle.
12. Re-enable the interrupts.
13. Verify the memory (table read).
An example of the required code is shown in
Example
Note: The default value of the holding registers on
Holding Register
Note:
Note:
Write 0x55 to EECON2.
The CPU will stall for the duration of the write for
T
IW
. (See Parameter D133A.)
7-3.
device Resets, and after write operations, is
FFh. A write of FFh to a holding register does
not modify that byte. This means that individ-
ual bytes of program memory may be
modified, provided that the change does not
attempt to change any bit from a ‘0’ to a ‘1’.
When modifying individual bytes, it is not nec-
essary to load all 64 or 128 holding registers
before executing a write operation.
8
Before setting the WR bit, the Table
Pointer address needs to be within the
intended address range of 64 or 128 bytes
in the holding register.
Self-write
EEPROM memory cannot be done while
running in LP Oscillator mode (Low-Power
mode). Therefore, executing a self-write
will put the device into High-Power mode.
TBLPTR = xxxx3F
execution
DS39957D-page 117
Holding Register
to
Flash
8
and