ST7FLITE29F2B6 STMicroelectronics, ST7FLITE29F2B6 Datasheet - Page 42

• Manufacturer Part Number: ST7FLITE29F2B6
• Description: IC MCU 8BIT 8K FLASH 20DIP
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST7FLITE29F2B6

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 15
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Data Converters: A/D 7x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Processor Series: ST7FLITE2x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 384 B
• Interface Type: SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 15
• Number Of Timers: 4 bit
• Operating Supply Voltage: 2.4 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Development Tools By Supplier: ST7FLIT2-COS/COM, ST7FLITE-SK/RAIS, ST7MDT10-DVP3, ST7MDT10-EMU3, STX-RLINK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 13 bit
• For Use With: 497-5858 - EVAL BOARD PLAYBACK ST7FLITE497-5049 - KIT STARTER RAISONANCE ST7FLITE497-5046 - KIT TOOL FOR ST7/UPSD/STR7 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-2134-5

ST7LITE2
POWER SAVING MODES (Cont’d)
Figure 26. ACTIVE-HALT Timing Overview
Figure 27. ACTIVE-HALT Mode Flow-chart
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 inter-
rupts can exit the MCU from ACTIVE-HALT mode.
Refer to Table 5, “Interrupt Mapping,” on page 35
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.
42/133
1
[Active Halt Enabled]
INSTRUCTION
(AWUCSR.AWUEN=0)
HALT INSTRUCTION
RUN
(Active Halt enabled)
N
HALT
INTERRUPT
ACTIVE
HALT
Y
256 OR 4096 CPU
CYCLE DELAY
INTERRUPT
3)
256 OR 4096 CPU CLOCK
RESET
OR SERVICE INTERRUPT
FETCH RESET VECTOR
OR
OSCILLATOR
PERIPHERALS
CPU
I BIT
OSCILLATOR
PERIPHERALS
CPU
I BIT
OSCILLATOR
PERIPHERALS
CPU
I BIT
N
CYCLE
RESET
Y
1)
VECTOR
FETCH
DELAY
RUN
2)
2)
OFF
OFF
OFF
ON
ON
ON
X
ON
ON
ON
X
0
4)
4)
9.6 AUTO WAKE UP FROM HALT MODE
Auto Wake Up From Halt (AWUFH) mode is simi-
lar to Halt mode with the addition of a specific in-
ternal RC oscillator for wake-up (Auto Wake Up
from Halt Oscillator). Compared to ACTIVE-HALT
mode, AWUFH has lower power consumption (the
main clock is not kept running, but there is no ac-
curate 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
(f
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 or 4096 cycle delay is used to stabilize
it. After this start-up delay, the CPU resumes oper-
ation 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 f
calculating the right prescaler value. Measurement
mode is enabled by setting the AWUM bit in the
AWUCSR register in Run mode. This connects
f
load timer, allowing the f
using the main oscillator clock as a reference time-
base.
AWU_RC
AWU_RC
f
AWU_RC
AWU RC
oscillator
divider
/64
to the input capture of the 12-bit Auto-Re-
). Its frequency is divided by a fixed divid-
prescaler/1 .. 255
to Timer input capture
AWUFH
AWU_RC
AWU_RC
to be measured
(ei0 source)
AWUFH
interrupt
and then