PIC18F8520-I/PT Microchip Technology Inc., PIC18F8520-I/PT Datasheet - Page 77
PIC18F8520-I/PT
Manufacturer Part Number
PIC18F8520-I/PT
Description
80 PIN, 32 KB FLASH, 2048 RAM, 68 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F8520-IPT.pdf
(380 pages)
Specifications of PIC18F8520-I/PT
A/d Inputs
16-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
1024 Bytes
Input Output
68
Interface
I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
80-pin TQFP
Programmable Memory
32K Bytes
Ram Size
2K Bytes
Speed
40 MHz
Timers
2-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F8520-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
Part Number:
PIC18F8520-I/PT
Manufacturer:
MICRCOHI
Quantity:
20 000
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6.2.3
Figure 6-3 shows an example of 16-bit Byte Select
mode for PIC18F8X20 devices. This mode allows table
write operations to word-wide external memories with
byte selection capability. This generally includes both
word-wide Flash and SRAM devices.
During a TBLWT cycle, the TABLAT data is presented
on the upper and lower byte of the AD15:AD0 bus. The
WRH signal is strobed for each write cycle; the WRL
pin is not used. The BA0 or UB/LB signals are used to
select the byte to be written, based on the Least
Significant bit of the TBLPTR register.
FIGURE 6-3:
2004 Microchip Technology Inc.
PIC18F8X20
Note 1: This signal only applies to table writes. See Section 5.1 “Table Reads and Table Writes”.
16-BIT BYTE SELECT MODE
AD<15:8>
A<19:16>
AD<7:0>
PIC18F6520/8520/6620/8620/6720/8720
WRH
WRL
ALE
BA0
OE
I/O
UB
LB
16-BIT BYTE SELECT MODE EXAMPLE
373
373
A<20:1>
A<20:1>
138
Flash and SRAM devices use different control signal
combinations to implement Byte Select mode. JEDEC
standard Flash memories require that a controller I/O
port pin be connected to the memory’s BYTE/WORD
pin to provide the select signal. They also use the BA0
signal from the controller as a byte address. JEDEC
standard static RAM memories, on the other hand, use
the UB or LB signals to select the byte.
A<x:1>
A<x:1>
CE
UB
A0
CE
BYTE/WORD
LB
OE
SRAM Memory
Address Bus
Data Bus
Control Lines
Flash Memory
WR
JEDEC Word
JEDEC Word
OE WR
(1)
D<15:0>
D<15:0>
DS39609B-page 75
(1)
D<15:0>
D<15:0>
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