PIC18F2520-I/SO Microchip Technology Inc., PIC18F2520-I/SO Datasheet - Page 251
PIC18F2520-I/SO
Manufacturer Part Number
PIC18F2520-I/SO
Description
28 Pin, 32 KB Flash, 1536 RAM, 25 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F2520-ISO.pdf
(390 pages)
Specifications of PIC18F2520-I/SO
A/d Inputs
10-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
256 Bytes
Input Output
25
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
28-pin SOIC
Programmable Memory
32K Bytes
Ram Size
1.5K Bytes
Speed
40 MHz
Timers
1-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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23.0
PIC18F2420/2520/4420/4520 devices include several
features intended to maximize reliability and minimize
cost through elimination of external components. These
are:
• Oscillator Selection
• Resets:
• Interrupts
• Watchdog Timer (WDT)
• Fail-Safe Clock Monitor
• Two-Speed Start-up
• Code Protection
• ID Locations
• In-Circuit Serial Programming
The oscillator can be configured for the application
depending on frequency, power, accuracy and cost. All
of the options are discussed in detail in Section 2.0
“Oscillator Configurations”.
A complete discussion of device Resets and interrupts
is available in previous sections of this data sheet.
In addition to their Power-up and Oscillator Start-up
Timers provided for Resets, PIC18F2420/2520/4420/
4520 devices have a Watchdog Timer, which is either
permanently enabled via the configuration bits or
software controlled (if configured as disabled).
TABLE 23-1:
2004 Microchip Technology Inc.
300001h
300002h
300003h
300005h
300006h
300008h
300009h
30000Ah
30000Bh
30000Ch
30000Dh
3FFFFEh DEVID1
3FFFFFh DEVID2
Legend:
Note 1:
- Power-on Reset (POR)
- Power-up Timer (PWRT)
- Oscillator Start-up Timer (OST)
- Brown-out Reset (BOR)
File Name
2:
SPECIAL FEATURES OF
THE CPU
CONFIG1H
CONFIG2L
CONFIG2H
CONFIG3H MCLRE
CONFIG4L DEBUG
CONFIG5L
CONFIG5H
CONFIG6L
CONFIG6H
CONFIG7L
CONFIG7H
x = unknown, u = unchanged, — = unimplemented, q = value depends on condition.
Shaded cells are unimplemented, read as ‘0’.
Unimplemented in PIC18F2420/4420 devices; maintain this bit set.
See Register 23-14 for DEVID1 values. DEVID registers are read-only and cannot be programmed by the user.
CONFIGURATION BITS AND DEVICE IDs
(1)
(1)
DEV10
WRTD
DEV2
IESO
Bit 7
CPD
—
—
—
—
—
—
FCMEN
EBTRB
XINST
WRTB
DEV1
DEV9
Bit 6
CPB
—
—
—
—
—
—
WRTC
DEV0
DEV8
Bit 5
—
—
—
—
—
—
—
—
—
—
PIC18F2420/2520/4420/4520
Preliminary
WDTPS3
BORV1
REV4
DEV7
Bit 4
—
—
—
—
—
—
—
—
—
WDTPS2
EBTR3
WRT3
FOSC3
BORV0
CP3
REV3
DEV6
The inclusion of an internal RC oscillator also provides
the additional benefits of a Fail-Safe Clock Monitor
(FSCM) and Two-Speed Start-up. FSCM provides for
background monitoring of the peripheral clock and
automatic switchover in the event of its failure. Two-
Speed Start-up enables code to be executed almost
immediately on start-up, while the primary clock source
completes its start-up delays.
All of these features are enabled and configured by
setting the appropriate configuration register bits.
23.1
The configuration bits can be programmed (read as ‘0’)
or left unprogrammed (read as ‘1’) to select various
device configurations. These bits are mapped starting
at program memory location 300000h.
The user will note that address 300000h is beyond the
user program memory space. In fact, it belongs to the
configuration memory space (300000h-3FFFFFh), which
can only be accessed using table reads and table writes.
Programming the configuration registers is done in a
manner similar to programming the Flash memory. The
WR bit in the EECON1 register starts a self-timed write
to the configuration register. In normal operation mode,
a TBLWT instruction with the TBLPTR pointing to the
configuration register sets up the address and the data
for the configuration register write. Setting the WR bit
starts a long write to the configuration register. The
configuration registers are written a byte at a time. To
write or erase a configuration cell, a TBLWT instruction
can write a ‘1’ or a ‘0’ into the cell. For additional details
on Flash programming, refer to Section 6.5 “Writing
to Flash Program Memory”.
Bit 3
—
—
—
—
—
(1)
(1)
(1)
LPT1OSC PBADEN CCP2MX
BOREN1 BOREN0 PWRTEN
WDTPS1 WDTPS0
EBTR2
WRT2
Configuration Bits
FOSC2
CP2
REV2
DEV5
Bit 2
LVP
—
—
—
(1)
(1)
(1)
FOSC1
EBTR1
WRT1
REV1
DEV4
Bit 1
CP1
—
—
—
—
STVREN
WDTEN
FOSC0
EBTR0
WRT0
REV0
DEV3
Bit 0
CP0
—
—
—
DS39631A-page 249
Unprogrammed
00-- 0111
---1 1111
---1 1111
1--- -011
10-- -1-1
---- 1111
11-- ----
---- 1111
111- ----
---- 1111
-1-- ----
xxxx xxxx
0000 1100
Default/
Value
(2)
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