參數資料
型號： PIC16C923
廠商： Microchip Technology Inc.
英文描述： 8-Bit CMOS Microcontroller with LCD Driver(每個I/O口有25mA驅動/吸收電流，1路捕捉/比較/PWM的微控制器)
中文描述： 8位CMOS微控制器與LCD驅動器（每個的I / O口有25毫安驅動/吸收電流，1路捕捉/比較/脈寬調制的微控制器）
文件頁數： 117/189頁
文件大小： 1544K
代理商： PIC16C923
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1997 Microchip Technology Inc.
DS30444E - page 117
PIC16C9XX
14.8
Power-down mode is entered by executing a
SLEEP
instruction.
If enabled, the Watchdog Timer will be cleared but
keeps running, the PD bit (STATUS<3>) is cleared, the
TO (STATUS<4>) bit is set, and the oscillator driver is
turned off. The I/O ports maintain the status they had,
before the
SLEEP
instruction was executed (driving
high, low, or hi-impedance).
For lowest current consumption in this mode, place all
I/O pins at either V
DD
, or V
SS
, ensure no external cir-
cuitry is drawing current from the I/O pin, power-down
the A/D, disable external clocks. Pull all I/O pins, that
are hi-impedance inputs, high or low externally to avoid
switching currents caused by floating inputs. The T0CKI
input should also be at V
DD
or V
SS
for lowest current
consumption. The contribution from on-chip pull-ups on
PORTB should be considered.
The MCLR pin must be at a logic high level (V
IHMC
).
Power-down Mode (SLEEP)
14.8.1
WAKE-UP FROM SLEEP
The device can wake up from SLEEP through one of
the following events:
1.
External reset input on MCLR pin.
2.
Watchdog Timer Wake-up (if WDT was
enabled).
3.
Interrupt from RB0/INT pin, RB port change, or
some peripheral interrupts.
External MCLR Reset will cause a device reset. All
other events are considered a continuation of program
execution and cause a “wake-up”. The TO and PD bits
in the STATUS register can be used to determine the
cause of device reset. The PD bit, which is set on
power-up is cleared when
SLEEP
is invoked. The TO bit
is cleared if a WDT time-out occurred (and caused
wake-up).
The following peripheral interrupts can wake the device
from SLEEP:
1.
TMR1 interrupt. Timer1 must be operating as an
asynchronous counter.
2.
SSP (Start/Stop) bit detect interrupt.
3.
SSP transmit or receive in slave mode (SPI/I
2
C).
4.
CCP capture mode interrupt.
5.
A/D conversion (when A/D clock source is RC).
6.
Special event trigger (Timer1 in asynchronous
mode using an external clock).
7.
LCD module.
Other peripherals can not generate interrupts since
during SLEEP, no on-chip Q clocks are present.
When the
SLEEP
instruction is being executed, the next
instruction (PC + 1) is pre-fetched. For the device to
wake-up through an interrupt event, the corresponding
interrupt enable bit must be set (enabled). Wake-up is
regardless of the state of the GIE bit. If the GIE bit is
clear (disabled), the device continues execution at the
instruction after the
SLEEP
instruction. If the GIE bit is
set (enabled), the device executes the instruction after
the
SLEEP
instruction and then branches to the inter-
rupt address (0004h). In cases where the execution of
the instruction following
SLEEP
is not desirable, the
user should have a
NOP
after the
SLEEP
instruction.
14.8.2
WAKE-UP USING INTERRUPTS
When global interrupts are disabled (GIE cleared) and
any interrupt source has both its interrupt enable bit
and interrupt flag bit set, one of the following will occur:
If the interrupt occurs
before
the execution of a
SLEEP
instruction, the
SLEEP
instruction will com-
plete as a NOP. Therefore, the WDT and WDT
postscaler will not be cleared, the TO bit will not
be set and PD bits will not be cleared.
If the interrupt occurs
during or after
the execu-
tion of a
SLEEP
instruction, the device will immedi-
ately wake up from sleep. The
SLEEP
instruction
will be completely executed before the wake-up.
Therefore, the WDT and WDT postscaler will be
cleared, the TO bit will be set and the PD bit will
be cleared.
Even if the flag bits were checked before executing a
SLEEP
instruction, it may be possible for flag bits to
become set before the
SLEEP
instruction completes. To
determine whether a
SLEEP
instruction executed, test
the PD bit. If the PD bit is set, the
SLEEP
instruction was
executed as a NOP.
To ensure that the WDT is cleared, a
CLRWDT
instruc-
tion should be executed before a
SLEEP
instruction.
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相關代理商/技術參數
參數描述
PIC16C923-04/L 功能描述:8位微控制器 -MCU 7KB 176 RAM 52 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC16C923-04/L 制造商:Microchip Technology Inc 功能描述:8BIT CMOS MCU SMD 16C923 PLCC68
PIC16C923-04/PT 功能描述:8位微控制器 -MCU 7KB 176 RAM 52 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC16C923-04/SP 制造商:Microchip Technology Inc 功能描述:
PIC16C923-04I/L 功能描述:8位微控制器 -MCU 7KB 176 RAM 52 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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