PIC16F946-E/PT Microchip Technology, PIC16F946-E/PT Datasheet - Page 212

• Manufacturer Part Number: PIC16F946-E/PT
• Description: Microcontroller
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F946-E/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 336 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 64-TFQFP
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 352 B
• Interface Type: SSP, I2C, AUSART, SPI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 53
• Number Of Timers: 3
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, MA160011
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MA160011 - DAUGHTER BOARD PICDEM LCD 16F91X
• Lead Free Status / Rohs Status: Details

PIC16F946
16.8
If
programmed, the on-chip program memory can be
read out using ICSP for verification purposes.
16.9
Four memory locations (2000h-2003h) are designated
as 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 mode.
Only the Least Significant 7 bits of the ID locations are
used.
16.10 In-Circuit Serial Programming
The PIC16F946 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
• programming voltage
This allows customers to manufacture boards with
unprogrammed devices and then program the micro-
controller just before shipping the product. This also
allows the most recent firmware or a custom firmware
to be programmed.
The device is placed into a Program/Verify mode by
holding
RB6/ICSPCLK/ICDCK/SEG14 pins low, while raising
the MCLR (V
“PIC16F91X/946 Memory Programming Specification”
(DS41244) for more information. RB7/ICSPDAT/ICD-
DAT/SEG13 becomes the programming data and
RB6/ICSPCLK/ICDCK/SEG14 becomes the program-
ming clock. Both RB7/ICSPDAT/ICDDAT/SEG13 and
RB6/ICSPCLK/ICDCK/SEG14 are Schmitt Trigger
inputs in this mode.
After Reset, to place the device into Program/Verify
mode, the Program Counter (PC) is at location 00h. 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 on
whether the command was a load or a read. For
complete details of serial programming, please refer to
the
Specification” (DS41244).
DS41265A-page 210
Note:
the
“PIC16F91X/946
Code Protection
ID Locations
code
the
The entire data EEPROM and Flash
program memory will be erased when the
code protection is turned off. See the
“PIC16F91X/946 Memory Programming
Specification” (DS41244) for more infor-
mation.
RB7/ICSPDAT/ICDDAT/SEG13
PP
protection
) pin from V
Memory
bit(s)
IL
have
to V
Programming
not
IHH
. See
been
and
Preliminary
A typical In-Circuit Serial Programming connection is
shown in Figure 16-11.
FIGURE 16-11:
External
Connector
Signals
Data I/O
CLK
+5V
V
0V
PP
* Isolation devices (as required)
*
To Normal
Connections
To Normal
Connections
TYPICAL IN-CIRCUIT
SERIAL PROGRAMMING
CONNECTION
*
© 2005 Microchip Technology Inc.
*
*
V
V
RE3/MCLR/V
RB6/ICSPCLK/
ICDCK/SEG14
RB7/ICSPDATA/
ICDDAT/SEG13
DD
SS
PIC16F946
PP