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参数资料
| 型号： | ST6382B1/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, MICROCONTROLLER, PDIP42 |
| 封装： | PLASTIC, SDIP-42 |
| 文件页数： | 14/82页 |
| 文件大小： | 1651K |
| 代理商： | ST6382B1/XXX |
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Obsolete
Product(s)
- Obsolete
Product(s)
21/82
ST6388, ST63E88, ST63T88
3.3 POWER SAVING MODES
STOP and WAIT modes have been implemented
in the ST638x in order to reduce the current con-
sumption of the device during idle periods. These
two modes are described in the following para-
graphs. Since the hardware activated digital
watchdog function is present, the STOP instruc-
tion is de-activated and any attempt to execute it
will cause the automatic execution of a WAIT in-
struction.
3.3.1 WAIT Mode
The configuration of the MCU in the WAIT mode
occurs as soon as the WAIT instruction is execut-
ed. The microcontroller can also be considered as
being in a “software frozen” state where the Core
stops processing the instructions of the routine,
the contents of the RAM locations and peripheral
registers are saved as long as the power supply
voltage is higher than the RAM retention voltage
but where the peripherals are still working. The
WAIT mode is used when the user wants to re-
duce the consumption of the MCU when it is in
idle, while not losing count of time or monitoring of
external events. The oscillator is not stopped in or-
der to provide clock signal to the peripherals. The
timers counting may be enabled (writing the PSI
bit in TSCR1 register) and the timer interrupt may
be also enabled before entering the WAIT mode;
this allows the WAIT mode to be left when timer in-
terrupt occurs. If the exit from the WAIT mode is
performed with a general RESET (either from the
activation of the external pin or by watchdog reset)
the MCU will enter a normal reset procedure as
described in the RESET chapter. If an interrupt is
generated during WAIT mode the MCU behaviour
depends on the state of the MCU Core before the
initialization of the WAIT sequence, but also of the
kind of the interrupt request that is generated. This
case will be described in the following paragraphs.
In any case, the MCU Core does not generate any
delay after the occurrence of the interrupt because
the oscillator clock is still available.
3.3.2 STOP Mode
Since the hardware activated watchdog is present
on the ST638x, the STOP instruction has been de-
activated. Any attempt to execute a STOP instruc-
tion will cause a WAIT instruction to be executed
instead.
3.3.3 Exit from WAIT Mode
The following paragraphs describe the output pro-
cedure of the MCU Core from WAIT mode when
an interrupt occurs. It must be noted that the re-
start sequence depends on the original state of the
MCU (normal, interrupt or non-maskable interrupt
mode) before the start of the WAIT sequence, but
also of the type of the interrupt request that is gen-
erated. In all cases the GEN bit of IOR has to be
set to 1 in order to restart from WAIT mode. Con-
trary to the operation of NMI in the run mode, the
NMI is masked in WAIT mode if GEN=0.
Normal Mode. If the MCU Core was in the main
routine when the WAIT instruction has been exe-
cuted, the Core exits from WAIT mode as soon as
an interrupt occurs; the corresponding interrupt
routine is executed, and at the end of the interrupt
service routine, the instruction that follows the
WAIT instruction is executed if no other interrupts
are pending.
Non-maskable Interrupt Mode. If the WAIT in-
struction has been executed during the execution
of the non-maskable interrupt routine, the MCU
Core outputs from WAIT mode as soon as any in-
terrupt occurs: the instruction that follows the
WAIT instruction is executed and the MCU Core is
still in the non-maskable interrupt mode even if an-
other interrupt has been generated.
Normal Interrupt Mode. If the MCU Core was in
the interrupt mode before the initialization of the
WAIT sequence, it outputs from the wait mode as
soon as any interrupt occurs. Nevertheless, two
cases have to be considered:
– If the interrupt is a normal interrupt, the interrupt
routine in which the WAIT was entered will be
completed with the execution of the instruction
that follows the WAIT and the MCU Core is still in
the interrupt mode. At the end of this routine
pending interrupts will be serviced in accordance
to their priority.
– If the interrupt is a non-maskable interrupt, the
non-maskable routine is processed at first. Then,
the routine in which the WAIT was entered will be
completed with the execution of the instruction
that follows the WAIT and the MCU Core is still in
the normal interrupt mode.
Notes:
If all the interrupt sources are disabled, the restart
of the MCU can only be done by a Reset activa-
tion. The Wait instruction is not executed if an en-
abled interrupt request is pending. In ST638x de-
vices, the hardware activated digital watchdog
function is present. As the watchdog is always ac-
tivated, the STOP instruction is de-activated and
any attempt to execute the STOP instruction will
cause an execution of a WAIT instruction.
相关PDF资料 |
PDF描述 |
|---|---|
| ST6386B1 | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST6388B1 | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST6387B1 | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST6394B1 | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST6399B1 | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST6382B4 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING |
| ST6383 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING |
| ST6383B1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING |
| ST6383B4 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING |
| ST6385 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCUs WITH ON-SCREEN-DISPLAY FOR TV TUNING |
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