PIC18F25K22-I/SO Microchip Technology Inc., PIC18F25K22-I/SO Datasheet - Page 98
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PIC18F25K22-I/SO
Manufacturer Part Number
PIC18F25K22-I/SO
Description
32KB, Flash, 1536bytes-RAM, 8-bit Family, nanoWatt XLP, 28 SOIC .300in TUBE
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F45K22-IP.pdf
(496 pages)
Specifications of PIC18F25K22-I/SO
A/d Inputs
17-Channel, 10-Bit
Comparators
2
Cpu Speed
16 MIPS
Eeprom Memory
256 Bytes
Input Output
24
Interface
I2C/SPI/UART/USART
Memory Type
Flash
Number Of Bits
8
Package Type
28-pin SOIC
Programmable Memory
32K Bytes
Ram Size
1.5K Bytes
Speed
64 MHz
Temperature Range
–40 to 125 °C
Timers
3-8-bit, 4-16-bit
Voltage, Range
1.8-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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PIC18(L)F2X/4XK22
6.2.2
The Table Latch (TABLAT) is an 8-bit register mapped
into the SFR space. The Table Latch register is used to
hold 8-bit data during data transfers between program
memory and data RAM.
6.2.3
The Table Pointer (TBLPTR) register addresses a byte
within the program memory. The TBLPTR is comprised
of three SFR registers: Table Pointer Upper Byte,
Table Pointer High Byte and Table Pointer Low Byte
(TBLPTRU:TBLPTRH:TBLPTRL). These three regis-
ters join to form a 22-bit wide pointer. The low-order
21 bits allow the device to address up to 2 Mbytes of
program memory space. The 22nd bit allows access to
the device ID, the user ID and the Configuration bits.
The Table Pointer register, TBLPTR, is used by the
TBLRD and TBLWT instructions. These instructions can
update the TBLPTR in one of four ways based on the
table operation. These operations on the TBLPTR
affect only the low-order 21 bits.
6.2.4
TBLPTR is used in reads, writes and erases of the
Flash program memory.
TABLE 6-1:
FIGURE 6-3:
DS41412D-page 98
TBLRD*
TBLWT*
TBLRD*+
TBLWT*+
TBLRD*-
TBLWT*-
TBLRD+*
TBLWT+*
Example
Note 1: n = 6 for block sizes of 64 bytes.
21
TABLAT – TABLE LATCH REGISTER
TBLPTR – TABLE POINTER
REGISTER
TABLE POINTER BOUNDARIES
TABLE POINTER OPERATIONS WITH TBLRD AND TBLWT INSTRUCTIONS
TBLPTRU
TABLE POINTER BOUNDARIES BASED ON OPERATION
16
15
TABLE ERASE/WRITE
TBLPTR<21:n+1>
TBLPTR is incremented before the read/write
TBLPTR is decremented after the read/write
TABLE READ – TBLPTR<21:0>
TBLPTR is incremented after the read/write
TBLPTRH
Preliminary
Operation on Table Pointer
(1)
TBLPTR is not modified
When a TBLRD is executed, all 22 bits of the TBLPTR
determine which byte is read from program memory
directly into the TABLAT register.
When a TBLWT is executed the byte in the TABLAT
register is written, not to Flash memory but, to a holding
register in preparation for a program memory write. The
holding registers constitute a write block which varies
depending on the device (see
LSbs of the TBLPTRL register determine which specific
address within the holding register block is written to.
The MSBs of the Table Pointer have no effect during
TBLWT operations.
When a program memory write is executed the entire
holding register block is written to the Flash memory at
the address determined by the MSbs of the TBLPTR.
The 3, 4, or 5 LSBs are ignored during Flash memory
writes. For more detail, see
Flash Program
When an erase of program memory is executed, the
16 MSbs
(TBLPTR<21:6>) point to the 64-byte block that will be
erased. The Least Significant bits (TBLPTR<5:0>) are
ignored.
Figure 6-3
TBLPTR based on Flash program memory operations.
8
7
describes the relevant boundaries of
of
Memory”.
the
TBLPTRL
2010 Microchip Technology Inc.
TBLPTR<n:0>
Table
TABLE WRITE
Section 6.5 “Writing to
Table
Pointer
6-1).The 3, 4, or 5
(1)
0
register
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