PIC18F45K20-I/ML Microchip Technology, PIC18F45K20-I/ML Datasheet - Page 68

• Manufacturer Part Number: PIC18F45K20-I/ML
• Description: IC PIC MCU FLASH 16KX16 44QFN
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F45K20-I/ML

• Program Memory Type: FLASH
• Program Memory Size: 32KB (16K x 16)
• Package / Case: 44-QFN
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 64MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 35
• Eeprom Size: 256 x 8
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 1.5 KB
• Interface Type: CCP/ECCP/EUSART/I2C/MSSP/SPI
• Maximum Clock Frequency: 64 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14-ch x 10-bit
• Package: 44QFN EP
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 64 MHz
• Operating Supply Voltage: 2.5|3.3 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DM240313 - BOARD DEMO 8BIT XLPAC164112 - VOLTAGE LIMITER MPLAB ICD2 VPPDM164124 - KIT STARTER FOR PIC18F4XK20AC164322 - MODULE SOCKET MPLAB PM3 28/44QFN
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PICkit™ 3 Debug Express
DS41370C-page 64
When the 32 locations are written with the pointer, they are not actually written to
program until the completion of the entire sequence. The pointer writes actually store
the data in 32 temporary hardware registers. When the actual write sequence is
executed, it is the contents of this 32-byte buffer that is written to the program memory
array. For example, we might use a for loop to write the contents of a RAM array to
these buffers using a ROM pointer.
This data is not actually in program memory yet, and won’t be until the entire write
sequence is completed as shown in Figure 3-51.
As an example for the above note, suppose using the following code we intended to
write to the 32 block of program memory from address 0x100 to 0x11F. The data would
actually be written to address 0x120 because the pointer is incremented to address
0x120 after the last write.
If the rom_pointer value were left at 0x11F, the data would be written as intended
started at 0x100.
for
{
*(rom_pointer
}
rom_pointer
for
{
*(rom_pointer++)
}
//
Note:
after the for loop, the rom_pointer address value is 0x120.
(i = 0; i < 32; i++)
(i = 0; i < 32; i++)
The program memory block that is written to is determined by the address
in the TBLPTRU:TBLPTRH:TBLPRTL Special Function Registers, exclud-
ing the 5 Least Significant bits. These bits are excluded to ensure the write
block begins on a 32-byte boundary. Therefore, it is critically important
that the pointer address is not incremented past the last address in
the block. If this occurs, the 32 bytes will be written at the next block
boundary instead of the intended one.
=
+
(near rom unsigned char *)0x100;
i)
=
ram_array[i];
=
ram_array[i];//
//
write to the holding registers
write to the holding registers
© 2009 Microchip Technology Inc.