PIC18F1320-H/ML Microchip Technology, PIC18F1320-H/ML Datasheet - Page 28
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PIC18F1320-H/ML
Manufacturer Part Number
PIC18F1320-H/ML
Description
IC MCU 8BIT 8KB FLASH 28QFN
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheet
1.PIC18F1220-ISO.pdf
(308 pages)
Specifications of PIC18F1320-H/ML
Core Processor
PIC
Core Size
8-Bit
Speed
25MHz
Connectivity
UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
16
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 7x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 150°C
Package / Case
28-VQFN Exposed Pad
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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PIC18F1220/1320
3.4
If the IDLEN bit is clear when a SLEEP instruction is
executed, the CPU and peripherals are both clocked
from the source selected using the SCS1:SCS0 bits.
While these operating modes may not afford the power
conservation of Idle or Sleep modes, they do allow the
device to continue executing instructions by using a
lower frequency clock source. RC_RUN mode also
offers the possibility of executing code at a frequency
greater than the primary clock.
Wake-up from a power managed Run mode can be
triggered by an interrupt, or any Reset, to return to full
power operation. As the CPU is executing code in Run
modes, several additional exits from Run modes are
possible. They include exit to Sleep mode, exit to a cor-
responding Idle mode and exit by executing a RESET
instruction. While the device is in any of the power
managed Run modes, a WDT time-out will result in a
WDT Reset.
3.4.1
The PRI_RUN mode is the normal full power execution
mode. If the SLEEP instruction is never executed, the
microcontroller operates in this mode (a SLEEP instruc-
tion is executed to enter all other power managed
modes). All other power managed modes exit to
PRI_RUN mode when an interrupt or WDT time-out
occur.
There is no entry to PRI_RUN mode. The OSTS bit is
set. The IOFS bit may be set if the internal oscillator
block is the primary clock source (see Section 2.7.1
“Oscillator Control Register”).
3.4.2
The SEC_RUN mode is the compatible mode to the
“clock switching” feature offered in other PIC18
devices. In this mode, the CPU and peripherals are
clocked from the Timer1 oscillator. This gives users the
option of lower power consumption while still using a
high accuracy clock source.
FIGURE 3-9:
DS39605F-page 26
Peripheral
Program
Counter
T1OSI
OSC1
Clock
Clock
CPU
Run Modes
PRI_RUN MODE
SEC_RUN MODE
Q1
Q2
PC
Q3
Q4
TIMING TRANSITION FOR ENTRY TO SEC_RUN MODE
Q1
1
2
3
Clock Transition
4
5
PC + 2
6
7
SEC_RUN mode is entered by clearing the IDLEN bit,
setting SCS1:SCS0 = 01 and executing a SLEEP
instruction. The system clock source is switched to the
Timer1 oscillator (see Figure 3-9), the primary oscilla-
tor is shut down, the T1RUN bit (T1CON<6>) is set and
the OSTS bit is cleared.
When a wake event occurs, the peripherals and CPU
continue to be clocked from the Timer1 oscillator while
the primary clock is started. When the primary clock
becomes ready, a clock switchback to the primary clock
occurs (see Figure 3-6). When the clock switch is com-
plete, the T1RUN bit is cleared, the OSTS bit is set and
the primary clock is providing the system clock. The
IDLEN and SCS bits are not affected by the wake-up.
The Timer1 oscillator continues to run.
Firmware can force an exit from SEC_RUN mode. By
clearing the T1OSCEN bit (T1CON<3>), an exit from
SEC_RUN back to normal full power operation is trig-
gered. The Timer1 oscillator will continue to run and
provide the system clock, even though the T1OSCEN
bit is cleared. The primary clock is started. When the
primary clock becomes ready, a clock switchback to the
primary clock occurs (see Figure 3-6). When the clock
switch is complete, the Timer1 oscillator is disabled, the
T1RUN bit is cleared, the OSTS bit is set and the pri-
mary clock is providing the system clock. The IDLEN
and SCS bits are not affected by the wake-up.
Note:
8
The Timer1 oscillator should already be
running prior to entering SEC_RUN mode.
If the T1OSCEN bit is not set when the
SLEEP instruction is executed, the SLEEP
instruction will be ignored and entry to
SEC_RUN mode will not occur. If the
Timer1 oscillator is enabled, but not yet
running, system clocks will be delayed
until the oscillator has started; in such
situations, initial oscillator operation is far
from stable and unpredictable operation
may result.
Q2
Q3
© 2007 Microchip Technology Inc.
Q4
Q1
PC + 2
Q2
Q3
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