PIC16F54-I/SS Microchip Technology, PIC16F54-I/SS Datasheet - Page 37

• Manufacturer Part Number: PIC16F54-I/SS
• Description: IC MCU FLASH 512X12 20SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F54-I/SS

• Core Size: 8-Bit
• Program Memory Size: 768B (512 x 12)
• Core Processor: PIC
• Speed: 20MHz
• Peripherals: POR, WDT
• Number Of I /o: 12
• Program Memory Type: FLASH
• Ram Size: 25 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SSOP
• Controller Family/series: PIC16F
• No. Of I/o's: 12
• Ram Memory Size: 25Byte
• Cpu Speed: 20MHz
• No. Of Timers: 1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164307 - MODULE SKT FOR PM3 28SSOPAC164014 - MODULE SKT PROMATEII 44PQFP
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

8.0
What sets a microcontroller apart from other processors
are special circuits that deal with the needs of real-time
applications. The PIC16F5X Family of microcontrollers
have a host of such features intended to maximize
system reliability, minimize cost through elimination of
external components, provide power -saving operating
modes and offer code protection. These features are:
• Oscillator Selection (Section 4.0 “Oscillator
• Reset (Section 5.0 “Reset”)
• Power-on Reset (Section 5.1 “Power-on Reset
• Device Reset Timer (Section 5.2 “Device Reset
• Watchdog Timer (WDT) (Section 8.2 “Watchdog
• Sleep (Section 8.3 “Power-Down Mode
• Code protection (Section 8.4 “Program
• User ID locations (Section 8.5 “User ID
• In-Circuit Serial Programming™ (ICSP™)
REGISTER 8-1:
 2004 Microchip Technology Inc.
bit 11
bit 11-4: Unimplemented: Read as ‘1’
bit 3:
bit 2:
bit 1-0:
Configurations”)
(POR)”)
Timer (DRT)”)
Timer (WDT)”)
(Sleep)”)
Verification/Code Protection”)
Locations”)
—
SPECIAL FEATURES OF THE
CPU
CP: Code Protection bit.
1 = Code protection off
0 = Code protection on
WDTE: Watchdog Timer Enable bit
1 = WDT enabled
0 = WDT disabled
FOSC1:FOSC0: Oscillator Selection bits
00 = LP oscillator
01 = XT oscillator
10 = HS oscillator
11 = RC oscillator
Legend:
R = Readable bit
-n = Value at POR
Note 1: Refer programming specifications “PIC16F54 Programming Specification” (DS41207) and
—
CONFIGURATION WORD FOR PIC16F54/57
“PIC16F57 Programming Specification” (DS41208) to determine how to access the
Configuration Word register. These documents can be found on the Microchip web site at
www.microchip.com.
—
—
W = Writable bit
‘1’ = bit is set
—
Preliminary
—
U = Unimplemented bit, read as ‘0’
‘0’ = bit is cleared
—
The PIC16F5X Family has a Watchdog Timer which
can be shut off only through configuration bit WDTE. It
runs off of its own RC oscillator for added reliability.
There is an 18 ms delay provided by the Device Reset
Timer (DRT), intended to keep the chip in Reset until
the crystal oscillator is stable. With this timer on-chip,
most applications need no external Reset circuitry.
The Sleep mode is designed to offer a very low current
Power-down mode. The user can wake-up from Sleep
through external Reset or through a Watchdog Timer
time-out. Several oscillator options are also made
available to allow the part to fit the application. The RC
oscillator option saves system cost, while the LP crystal
option saves power. A set of configuration bits are used
to select various options.
8.1
Configuration bits can be programmed to select various
device configurations. Two bits are for the selection of
the oscillator type; one bit is the Watchdog Timer
enable bit; one bit is for code protection for the
PIC16F54 and PIC16F57 devices (Register 8-1).
Configuration Bits
—
CP
WDTE
x = bit is unknown
PIC16F5X
FOSC1
DS41213B-page 35
FOSC0
bit 0