ST62T20CB6 STMicroelectronics, ST62T20CB6 Datasheet - Page 33

• Manufacturer Part Number: ST62T20CB6
• Description: IC MCU 8BIT OTP 4K 20 PDIP
• Manufacturer: STMicroelectronics
• Series: ST6r

Specifications of ST62T20CB6

• Core Processor: ST6
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LVD, POR, WDT
• Number Of I /o: 12
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: OTP
• Ram Size: 64 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 6 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Controller Family/series: ST6
• No. Of I/o's: 12
• Ram Memory Size: 64Byte
• Cpu Speed: 8MHz
• No. Of Timers: 1
• Rohs Compliant: Yes
• Processor Series: ST62T2x
• Core: ST6
• Data Bus Width: 8 bit
• Data Ram Size: 64 B
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Operating Supply Voltage: 3 V to 6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Development Tools By Supplier: ST622XC-KIT/110, ST62GP-EMU2, ST62E2XC-EPB/110, ST62E6XC-EPB/US, STREALIZER-II
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -
• Lead Free Status / Rohs Status: In Transition
• Other names: 497-2098-5

6.2 WAIT MODE
The MCU goes into WAIT mode as soon as the
WAIT instruction is executed. This has the follow-
ing effects:
– Program execution is stopped, the microcontrol-
– RAM contents and peripheral registers are pre-
– The oscillator is kept running to provide a clock
WAIT mode can be used when the user wants to
reduce the MCU power consumption during idle
periods, while not losing track of time or the ability
to monitor external events. WAIT mode places the
MCU in a low power consumption mode by stop-
ping the CPU. The active oscillator (main oscillator
or LFAO) is kept running in order to provide a clock
signal to the peripherals.
If the power consumption has to be further re-
duced, the Low Frequency Auxiliary Oscillator
(LFAO) can be used in place of the main oscillator,
if its operating frequency is lower. If required, the
LFAO must be switched on before entering WAIT
mode.
Exit from Wait mode
The MCU remains in WAIT mode until one of the
following events occurs:
– RESET (Watchdog, LVD or RESET pin)
– A peripheral interrupt (timer, ADC,...),
– An external interrupt (I/O port, NMI)
The Program Counter then branches to the start-
ing address of the interrupt or RESET service rou-
tine. Refer to
See also
ler software can be considered as being in a “fro-
zen” state.
served as long as the power supply voltage is
higher than the RAM retention voltage.
to the peripherals; they are still active.
Section
Figure
6.4.1.
20.
Figure 20. WAIT Mode Flowchart
WAIT INSTRUCTION
N
ST6208C/ST6209C/ST6210C/ST6220C
INTERRUPT
Y
OR SERVICE INTERRUPT
OSCILLATOR
Clock to PERIPHERALS
Clock to CPU
OSCILLATOR
Clock to PERIPHERALS
Clock to CPU
FETCH RESET VECTOR
OSCILLATOR
Clock to PERIPHERALS
Clock to CPU
N
CLOCK CYCLE
RESET
Y
DELAY
2048
Restart
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Yes
Yes
Yes
Yes
Yes
On
No
On
1