PIC16F767-E/ML Microchip Technology, PIC16F767-E/ML Datasheet - Page 39

• Manufacturer Part Number: PIC16F767-E/ML
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,LLCC,28PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F767-E/ML

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 25
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: FLASH
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.6
The PIC16F7X7 devices include a feature that allows
the system clock source to be switched from the main
oscillator to an alternate low-frequency clock source.
PIC16F7X7 devices offer three alternate clock sources.
When enabled, these give additional options for
switching to the various power-managed operating
modes.
Essentially, there are three clock sources for these
devices:
• Primary oscillators
• Secondary oscillators
• Internal oscillator block (INTRC)
The primary oscillators include the External Crystal
and Resonator modes, the External RC modes, the
External Clock mode and the internal oscillator block.
The particular mode is defined on POR by the contents
of Configuration Word 1. The details of these modes
are covered earlier in this chapter.
The secondary oscillators are those external sources
not connected to the OSC1 or OSC2 pins. These
sources may continue to operate even after the
controller is placed in a power-managed mode.
PIC16F7X7 devices offer the Timer1 oscillator as a
secondary oscillator. This oscillator continues to run
when a SLEEP instruction is executed and is often the
time base for functions, such as a real-time clock.
Most often, a 32.768 kHz watch crystal is connected
between the RC0/T1OSO/T1CKI and RC1/T1OSI/CCP2
pins. Like the LP mode oscillator circuit, loading capaci-
tors are also connected from each pin to ground. The
Timer1 oscillator is discussed in greater detail in
Section 7.6 “Timer1 Oscillator”.
In addition to being a primary clock source, the internal
oscillator block is available as a power-managed
mode clock source. The 31.25 kHz INTRC source is
also used as the clock source for several special
features, such as the WDT, Fail-Safe Clock Monitor,
Power-up Timer and Two-Speed Start-up.
The clock sources for the PIC16F7X7 devices are shown
in Figure 4-6. See Section 7.0 “Timer1 Module” for
further details of the Timer1 oscillator. See Section 15.1
“Configuration Bits” for Configuration register details.
4.6.1
The OSCCON register (Register 4-2) controls several
aspects of the system clock’s operation, both in full
power operation and in power-managed modes.
The system clock select bits, SCS1:SCS0, select the
clock source that is used when the device is operating
in power-managed modes. When the bits are cleared
(SCS<1:0> = 00), the system clock source comes from
 2004 Microchip Technology Inc.
Clock Sources and Oscillator
Switching
OSCCON REGISTER
the
FOSC2:FOSC0 configuration bits in Configuration
Register 1. When the bits are set in any other manner,
the system clock source is provided by the Timer1
oscillator (SCS1:SCS0 = 01) or from the internal
oscillator block (SCS1:SCS0 = 10). After a Reset,
SCS<1:0> are always set to ‘00’.
The internal oscillator select bits, IRCF2:IRCF0, select
the frequency output of the internal oscillator block that
is used to drive the system clock. The choices are the
INTRC source (31.25 kHz), the INTOSC source
(8 MHz) or one of the six frequencies derived from the
INTOSC postscaler (125 kHz to 4 MHz). Changing the
configuration of these bits has an immediate change on
the multiplexor’s frequency output.
The OSTS and IOFS bits indicate the status of the
primary oscillator and INTOSC source; these bits are
set when their respective oscillators are stable. In
particular, OSTS indicates that the Oscillator Start-up
Timer has timed out.
4.6.2
Clock switching will occur for the following reasons:
• The FCMEN (CONFIG2<0>) bit is set, the device
• The FCMEN bit is set, the device is running from
• Following a wake-up due to a Reset or a POR,
• A wake-up from Sleep occurs due to interrupt or
• SCS bits are modified from their original value.
• IRCF bits are modified from their original value.
is running from the primary oscillator and the
primary oscillator fails. The clock source will be
the internal RC oscillator.
the Timer1 oscillator (T1OSC) and T1OSC fails.
The clock source will be the internal RC oscillator.
when the device is configured for Two-Speed
Start-up mode, switching will occur between the
INTRC and the system clock defined by the
FOSC<2:0> bits.
WDT wake-up and Two-Speed Start-up is
enabled. If the primary clock is XT, HS or LP, the
clock will switch between the INTRC and the
primary system clock after 1024 clocks and
8 clocks of the primary oscillator. This is
conditional upon the SCS bits being set equal
to ‘00’.
Note:
main
CLOCK SWITCHING
Because the SCS bits are cleared on any
Reset, no clock switching will occur on a
Reset unless the Two-Speed Start-up is
enabled and the primary clock is XT, HS or
LP. The device will wait for the primary
clock to become stable before execution
begins (Two-Speed Start-up disabled).
oscillator
that
PIC16F7X7
is
selected
DS30498C-page 37
by
the