PIC18LF6621-I/PT Microchip Technology, PIC18LF6621-I/PT Datasheet - Page 75
![IC PIC MCU FLASH 32KX16 64TQFP](/photos/6/81/68123/c04-066_pf_sml.jpg)
PIC18LF6621-I/PT
Manufacturer Part Number
PIC18LF6621-I/PT
Description
IC PIC MCU FLASH 32KX16 64TQFP
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC18F6525-IPT.pdf
(396 pages)
3.PIC18F6525-IPT.pdf
(8 pages)
Specifications of PIC18LF6621-I/PT
Core Size
8-Bit
Program Memory Size
64KB (32K x 16)
Core Processor
PIC
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
53
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
3.8K x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TFQFP
Controller Family/series
PIC18
No. Of I/o's
53
Eeprom Memory Size
1024Byte
Ram Memory Size
3.75KB
Cpu Speed
40MHz
No. Of Timers
5
Processor Series
PIC18LF
Core
PIC
Data Bus Width
8 bit
Data Ram Size
3840 B
Interface Type
MSSP, SPI, I2C, EUSART
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
53
Number Of Timers
2 x 8 bit
Operating Supply Voltage
2 V to 5.5 V
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, ICE2000, ICE4000, DV164136, DM183032
Minimum Operating Temperature
- 40 C
On-chip Adc
12 bit
Package
64TQFP
Device Core
PIC
Family Name
PIC18
Maximum Speed
40 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18LF6621-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
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6.2
The external memory interface implemented in
PIC18F8525/8621 devices operates only in 16-bit
mode. The mode selection is not software configurable
but is programmed via the configuration bits.
The WM1:WM0 bits in the MEMCON register
determine three types of connections in 16-bit mode.
They are referred to as:
• 16-bit Byte Write
• 16-bit Word Write
• 16-bit Byte Select
These three different configurations allow the designer
maximum flexibility in using 8-bit and 16-bit memory
devices.
For all 16-bit modes, the Address Latch Enable (ALE)
pin indicates that the address bits, A15:A0, are
available on the external memory interface bus.
Following the address latch, the Output Enable signal
(OE) will enable both bytes of program memory at once
to form a 16-bit instruction word. The Chip Enable
signal (CE) is active at any time that the microcontroller
accesses external memory, whether reading or writing;
it is inactive (asserted high) whenever the device is in
Sleep mode.
FIGURE 6-1:
2005 Microchip Technology Inc.
Note 1: This signal only applies to table writes. See Section 5.1 “Table Reads and Table Writes”.
16-Bit Mode
PIC18F8X2X
AD<15:8>
A<19:16>
AD<7:0>
WRH
WRL
ALE
CE
OE
16-BIT BYTE WRITE MODE EXAMPLE
PIC18F6525/6621/8525/8621
373
373
D<7:0>
A<19:0>
D<15:8>
In Byte Select mode, JEDEC standard Flash memories
will require BA0 for the byte address line and one I/O
line, to select between Byte and Word mode. The other
16-bit modes do not need BA0. JEDEC standard static
RAM memories will use the UB or LB signals for byte
selection.
6.2.1
Figure 6-1 shows an example of 16-bit Byte Write mode
for PIC18F8525/8621 devices. This mode is used for
two separate 8-bit memories connected for 16-bit
operation. This generally includes basic EPROM and
Flash devices. It allows table writes to byte-wide external
memories.
During a TBLWT instruction cycle, the TABLAT data is
presented on the upper and lower bytes of the
AD15:AD0 bus. The appropriate WRH or WRL control
line is strobed on the LSb of the TBLPTR.
16-BIT BYTE WRITE MODE
A<x:0>
D<7:0>
CE
OE
(MSB)
WR
(1)
Address Bus
Data Bus
Control Lines
D<7:0>
DS39612B-page 73
A<x:0>
D<7:0>
CE
OE
(LSB)
WR
(1)
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