PIC16F54-I/SS Microchip Technology, PIC16F54-I/SS Datasheet - Page 39

• 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

8.3
A device may be powered down (Sleep) and later
powered up (wake-up from Sleep).
8.3.1
The Power-down mode is entered by executing a
SLEEP instruction.
If enabled, the Watchdog Timer will be cleared but
keeps running, the TO bit (Status<4>) is set, the PD bit
(Status<3>) is cleared and the oscillator driver is turned
off. The I/O ports maintain the status they had before
the SLEEP instruction was executed (driving high,
driving low or high-impedance).
It should be noted that a Reset generated by a WDT
time-out does not drive the MCLR/V
For lowest current consumption while powered down,
the T0CKI input should be at V
MCLR/V
(MCLR = V
8.3.2
The device can wake-up from Sleep through one of the
following events:
1.
2.
Both of these events cause a device Reset. The TO
and PD bits can be used to determine the cause of
device Reset. The TO bit is cleared if a WDT time-out
occurred (and caused wake-up). The PD bit, which is
set on power-up, is cleared when SLEEP is invoked.
The WDT is cleared when the device wakes from
Sleep, regardless of the wake-up source.
8.4
If the code protection bit has not been programmed, the
on-chip program memory can be read out for
verification purposes.
Once code protection is enabled, all program memory
locations above 0x3F read all ‘0’s. Program memory
locations 0x00-0x3F are always unprotected. The user
ID locations and the Configuration Word read out in an
unprotected fashion. It is possible to program the user
ID locations and the Configuration Word after code
protect is enabled.
8.5
Four memory locations are designated as user ID
locations where the user can store checksum or other
code-identification numbers. These locations are not
accessible during normal execution, but are readable
and writable during Program/Verify.
 2004 Microchip Technology Inc.
An external Reset input on MCLR/V
A Watchdog Timer time-out Reset (if WDT was
enabled).
PP
Power-Down Mode (Sleep)
Program Verification/Code
Protection
User ID Locations
IH
pin must be at a logic high level
SLEEP
WAKE-UP FROM SLEEP
).
DD
PP
or V
pin low.
PP
SS
pin.
and the
Preliminary
Use only the lower 4 bits of the user ID locations and
always program the upper 8 bits as ‘1’s.
8.6
The PIC16F5X microcontrollers can be serially
programmed while in the end application circuit. This is
simply done with two lines for clock and data, and three
other lines for power, ground and the programming
voltage. This allows customers to manufacture boards
with unprogrammed devices and then program the
microcontroller just before shipping the product. Thus,
the most recent firmware or custom firmware can be
programmed.
The device is placed into a Program/Verify mode by
holding the RB6 and RB7 pins low while raising the
MCLR (V
specification). RB6 becomes the programming clock
and RB7 becomes the programming data. Both RB6
and RB7 are Schmitt Trigger inputs in this mode.
A 6-bit command is then supplied to the device.
Depending on the command, 14 bits of program data
are then supplied to or from the device, depending if
the command was a Load or a Read. For complete
details of serial programming, please refer to the
respective programming specifications “PIC16F54
Programming
“PIC16F57 Programming Specification” (DS41208).
A typical In-Circuit Serial Programming connection is
shown in Figure 8-2.
FIGURE 8-2:
Note:
External
Connector
Signals
Data I/O
CLK
+5V
V
In-Circuit Serial Programming™
(ICSP™)
0V
PP
PP
Microchip will assign a unique pattern
number for QTP and SQTP
This pattern number will be unique and
traceable to the submitted code.
) pin from V
To Normal
Connections
Specification”
To Normal
Connections
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING
CONNECTION
IL
to V
PIC16F5X
IHH
V
V
MCLR/V
RB6/ICSPCLK
RB7/ICSPDAT
V
DD
SS
DD
(DS41207)
(see programming
DS41213B-page 37
PIC16F5X
PP
SM
requests.
and