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参数资料
| 型号： | ST7PL35F2UA/XXXE |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20 |
| 封装： | 5 X 6 MM, ROHS COMPLIANT, QFN-20 |
| 文件页数： | 106/168页 |
| 文件大小： | 2955K |
| 代理商： | ST7PL35F2UA/XXXE |
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Obsolete
Product(s)
- Obsolete
Product(s)
ST7L34, ST7L35, ST7L38, ST7L39
42/168
POWER SAVING MODES (cont’d)
Figure 26. ACTIVE HALT Timing Overview
Figure 27. ACTIVE HALT Mode Flowchart
Notes:
1. This delay occurs only if the MCU exits ACTIVE HALT
mode by means of a RESET.
2. Peripherals clocked with an external clock source can
still be active.
3. Only the RTC1 interrupt and some specific interrupts
can exit the MCU from ACTIVE HALT mode. Refer to
Table 6, “Interrupt Mapping,” on page 36 for more details.
4. Before servicing an interrupt, the CC register is pushed
on the stack. The I bit of the CC register is set during the
interrupt routine and cleared when the CC register is
popped.
9.6 AUTO WAKE UP FROM HALT MODE
Auto Wake Up From Halt (AWUFH) mode is simi-
lar to Halt mode with the additional of an internal
RC oscillator for wake-up. Compared to ACTIVE
HALT mode, AWUFH has lower power consump-
tion (the main clock is not kept running), but there
is no accurate realtime clock available.
It is entered by executing the HALT instruction
when the AWUEN bit in the AWUCSR register has
been set.
Figure 28. AWUFH Mode Block Diagram
As soon as HALT mode is entered and if the
AWUEN bit has been set in the AWUCSR register,
the AWU RC oscillator provides a clock signal
(fAWU_RC). Its frequency is divided by a fixed divid-
er and a programmable prescaler controlled by the
AWUPR register. The output of this prescaler pro-
vides the delay time. When the delay has elapsed
the AWUF flag is set by hardware and an interrupt
wakes-up the MCU from Halt mode. At the same
time the main oscillator is immediately turned on
and a 256 cycle delay is used to stabilize it. After
this start-up delay, the CPU resumes operation by
servicing the AWUFH interrupt. The AWU flag and
its associated interrupt are cleared by software
reading the AWUCSR register.
To compensate for any frequency dispersion of
the AWU RC oscillator, it can be calibrated by
measuring the clock frequency fAWU_RC and then
calculating the right prescaler value. Measurement
mode is enabled by setting the AWUM bit in the
AWUCSR register in Run mode. This connects
fAWU_RC to the input capture of the 12-bit Autore-
load timer, allowing the fAWU_RC to be measured
using the main oscillator clock as a reference time-
base.
HALT
RUN
256 OR 4096 CPU
CYCLE DELAY1)
RESET
OR
INTERRUPT
HALT
INSTRUCTION
FETCH
VECTOR
ACTIVE
[Active Halt Enabled]
HALT INSTRUCTION
RESET
INTERRUPT 3)
Y
N
Y
CPU
OSCILLATOR
PERIPHERALS 2)
IBIT
ON
OFF
0
OFF
FETCH RESET VECTOR
OR SERVICE INTERRUPT
CPU
OSCILLATOR
PERIPHERALS 2)
IBIT
ON
OFF
X 4)
ON
CPU
OSCILLATOR
PERIPHERALS
IBIT
ON
X 4)
ON
256 OR 4096 CPU
DELAY
(Active Halt enabled)
(AWUCSR.AWUEN=0)
CLOCK CYCLE
AWU RC
AWUFH
fAWU_RC
AWUFH
(ei0 source)
Oscillator
prescaler/1 .. 255
interrupt
/64
divider
to
1
0
AWUCK Opt bit
Input Capture
32 kHz
Oscillator
Timer
Autoreload
1
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PDF描述 |
|---|---|
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| ST7L39F2MC/XXXE | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20 |
| ST7L39F2UC/XXXRE | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, QCC20 |
| ST7PL34F2MC/XXXE | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20 |
相关代理商/技术参数 |
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