PIC16HV540-04/P Microchip Technology, PIC16HV540-04/P Datasheet - Page 39

• Manufacturer Part Number: PIC16HV540-04/P
• Description: IC MCU OTP 512X12 18DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16HV540-04/P

• Core Size: 8-Bit
• Program Memory Size: 768B (512 x 12)
• Core Processor: PIC
• Speed: 4MHz
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 12
• Program Memory Type: OTP
• Ram Size: 25 x 8
• Voltage - Supply (vcc/vdd): 3.5 V ~ 15 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 18-DIP (0.300", 7.62mm)
• Controller Family/series: PIC16HV
• No. Of I/o's: 12
• Ram Memory Size: 25Byte
• Cpu Speed: 4MHz
• No. Of Timers: 1
• Digital Ic Case Style: DIP
• Processor Series: PIC16H
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 25 B
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 8
• Operating Supply Voltage: 3.5 V to 15 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164001 - MODULE SKT PROMATEII 18/28DIP
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details

FIGURE 7-11: BROWN-OUT SITUATIONS
7.7
The Watchdog Timer (WDT) is a free running on-chip
RC oscillator which does not require any external com-
ponents. This RC oscillator is separate from the RC
oscillator of the OSC1/CLKIN pin. That means that the
WDT will run even if the clock on the OSC1/CLKIN and
OSC2/CLKOUT pins have been stopped, for example,
by execution of a SLEEP instruction. During normal
operation or SLEEP, a WDT Reset or Wake-up Reset
generates a device RESET.
The TO bit (STATUS<4>) will be cleared upon a Watch-
dog Timer Reset.
The Watchdog Timer is enabled/disabled by a device
configuration bit (see Figure 7-1). If the WDT is
enabled, software execution may not disable this func-
tion. When the WDTEN configuration bit is cleared, the
SWDTEN bit, OPTION2<4>, enables/disables the
operation of the WDT.
7.7.1
The WDT has a nominal time-out period of 18 ms, (with
no prescaler). If a longer time-out period is desired, a
prescaler with a division ratio of up to 1:128 can be
assigned to the WDT (under software control) by writ-
ing to the OPTION register. Thus, time-out a period of
a nominal 2.3 seconds can be realized. These periods
vary with temperature, V
variations (see DC specs).
Under worst case conditions (V
= Max., max. WDT prescaler), it may take several sec-
onds before a WDT time-out occurs.
2000 Microchip Technology Inc.
Note 1:
Watchdog Timer (WDT)
WDT PERIOD
2:
Internal
Internal
Internal
Reset
Reset
Reset
BV
DRT time depends on which oscillator mode is selected and which reset state the part is in.
V
V
V
REG
REG
REG
DD
depends on selection of bit ‘RL’ in OPTION2 SFR.
DD
and part-to-part process
DD
= Min., Temperature
Preliminary
18 ms
18 ms
(2)
7.7.2
The CLRWDT instruction clears the WDT and the
postscaler, if assigned to the WDT, and prevents it from
timing out and generating a device RESET.
The SLEEP instruction resets the WDT and the
postscaler, if assigned to the WDT. This gives the max-
imum SLEEP time before a WDT Wake-up Reset.
7.8
The PIC16HV540 has 2 internal voltage regulators.
The PORTA I/O pads and OSC2 are powered by one
internal voltage regulator V
voltage regulator V
core. Both regulated voltage levels can be synchro-
nously switched in the active modes between 3V and
5V through bit “RL” in the OPTION2 register. In addi-
tion, the “SL” bit in the OPTION2 register can be used
to control the core’s regulated voltage level during
SLEEP mode. V
to the V
The on-chip Brown-out Detect circuitry monitors the
CPU regulated voltage V
brown-out reset is generated (see Section 7.6 for more
details on the BOD).
The regulator circuits are identical in functional nature
but only the V
externally (See Section 10.1 for V
operational voltage range and pin loading requirements
must be considered to ensure proper system operation.
For example, if 3V regulation is implemented during the
SLEEP mode and 40mA is being sourced from PORTA,
the V
minimum voltage. This may be an issue to consider for
connections to external circuitry. Likewise, if zero cur-
rent is sourced from the PORTA pins, the regulation
(2)
18 ms
18 ms
IO
(2)
(2)
DD
regulation voltage may approach the specified
WDT PROGRAMMING CONSIDERATIONS
Internal Voltage Regulators
pin.
IO
REG
regulator voltage can be measured,
REG
regulates the 15V power applied
PIC16HV540
, powers the PICmicro
IO
REG
, while the second internal
BV
BV
BV
, for determining if a
DD
DD
DD
(1)
(1)
(1)
IO
DS40197B-page 39
parameters). The
®
device