PIC18F85K22-I/PT Microchip Technology, PIC18F85K22-I/PT Datasheet - Page 126

• Manufacturer Part Number: PIC18F85K22-I/PT
• Description: IC, 8BIT MCU, PIC18F, 64MHZ, TQFP-80
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F85K22-I/PT

• Controller Family/series: PIC18
• No. Of I/o's: 69
• Eeprom Memory Size: 1KB
• Ram Memory Size: 2KB
• Cpu Speed: 64MHz
• No. Of Timers: 8
• Core Size: 8 Bit
• Program Memory Size: 32KB
• Core Processor: PIC
• Speed: 64MHz
• Connectivity: EBI/EMI, I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 24x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F87K22 FAMILY
8.6.2
Figure 8-2
mode for PIC18F87K22 family devices. This mode is
used for word-wide memories, which includes some of
the EPROM and Flash type memories. This mode
allows opcode fetches and table reads from all forms of
16-bit memory, and table writes to any type of
word-wide external memories. This method makes a
distinction between TBLWT cycles to even or odd
addresses.
During
(TBLPTR<0> = 0), the TABLAT data is transferred to a
holding latch and the external address data bus is
tri-stated for the data portion of the bus cycle. No write
signals are activated.
FIGURE 8-2:
DS39960D-page 126
Note 1:
a
shows an example of 16-Bit Word Write
16-BIT WORD WRITE MODE
PIC18F87K22
TBLWT
2:
A<19:16>
AD<15:8>
Upper order address lines are used only for 20-bit address widths.
This signal only applies to table writes. See
AD<7:0>
cycle
16-BIT WORD WRITE MODE EXAMPLE
WRH
ALE
CE
OE
(1)
to
an
even
address
373
373
Section 7.1 “Table Reads and Table
During
(TBLPTR<0> = 1), the TABLAT data is presented on
the upper byte of the AD<15:0> bus. The contents of
the holding latch are presented on the lower byte of the
AD<15:0> bus.
The WRH signal is strobed for each write cycle; the
WRL pin is unused. The signal on the BA0 pin indicates
the LSb of the TBLPTR, but it is left unconnected.
Instead, the UB and LB signals are active to select both
bytes. The obvious limitation to this method is that the
table write must be done in pairs on a specific word
boundary to correctly write a word location.
A<20:1>
D<15:0>
a
TBLWT
Address Bus
Data Bus
Control Lines
 2009-2011 Microchip Technology Inc.
D<15:0>
A<x:0>
cycle
CE
Writes”.
EPROM Memory
to
OE
JEDEC Word
an
WR
odd
(2)
address