ST10F269Z2Q6 STMicroelectronics, ST10F269Z2Q6 Datasheet - Page 113

• Manufacturer Part Number: ST10F269Z2Q6
• Description: MCU 16BIT 256K FLASH 144PQFP
• Manufacturer: STMicroelectronics
• Series: ST10r

Specifications of ST10F269Z2Q6

• Core Processor: ST10
• Core Size: 16-Bit
• Speed: 40MHz
• Connectivity: CAN, EBI/EMI, SSC, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 111
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 12K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-QFP
• Controller Family/series: ST10
• No. Of I/o's: 111
• Ram Memory Size: 12KB
• Cpu Speed: 40MHz
• No. Of Timers: 5
• Embedded Interface Type: CAN, SSC, USART
• Rohs Compliant: Yes
• Processor Series: ST10F26x
• Core: ST10
• Data Bus Width: 16 bit
• Data Ram Size: 12 KB
• Interface Type: CAN, SSC, USART
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 111
• Number Of Timers: 2 x 16 bit
• Operating Supply Voltage: 0.3 V to 4 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 16 bit x 10 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 497-4833

ST10F269
The PONR flag of WDTCON register is set if the output voltage of the internal 3.3V supply falls below the
threshold (typically 2V) of the power-on detection circuit. This circuit is efficient to detect major failures of
the external 5V supply but if the internal 3.3V supply does not drop under 2 volts, the PONR flag is not
set. This could be the case on fast switch-off / switch-on of the 5V supply. The time needed for such a
sequence to activate the PONR flag depends on the value of the capacitors connected to the supply and
on the exact value of the internal threshold of the detection circuit.
Table 34 : WDTCON Bit Value on Different Resets
Notes: 1. PONR bit may not be set for short supply failure.
In case of bi-directional reset is enabled, and if the RSTIN pin is latched low after the end of the internal
reset sequence, then a Short hardware reset, a software reset or a watchdog reset will trigger a Long
hardware reset. Thus, Reset Indications flags will be set to indicate a Long Hardware Reset.
The Watchdog Timer is 16-bit, clocked with the system clock divided by 2 or 128. The high Byte of the
watchdog timer register can be set to a pre-specified reload value (stored in WDTREL).
Each time it is serviced by the application software, the high byte of the watchdog timer is reloaded. For
security, rewrite WDTCON each time before the watchdog timer is serviced
Table 35 shows the watchdog time range for 40MHz CPU clock and Table 36 shows the watchdog time
range for 32MHz CPU clock.
Table 35 : WDTREL Reload Value (PQFP144 devices)
Table 36 : WDTREL Reload Value (TQFP144 devices)
The watchdog timer period is calculated with the following formula:
P
Power On Reset
Power on after partial supply failure
Long Hardware Reset
Short Hardware Reset
Software Reset
Watchdog Reset
WD T
2. For power-on reset and reset after supply partial failure, asynchronous reset must be used.
Reload value in WDTREL
Reload value in WDTREL
=
-------------- -
f
Reset Source
CPU
1
FFh
FFh
00h
00h
512
1
+
W DTIN
PONR
1) 2)
X
63
2 (WDTIN = ‘0’)
2 (WDTIN = ‘0’)
3.276ms
4.096ms
12.8 s
16.0 s
256
LHWR
–
X
X
X
W DTREL
Prescaler for f
Prescaler for f
SHWR
X
X
X
X
CPU
CPU
= 40MHz
= 32MHz
17 - WATCHDOG TIMER
128 (WDTIN = ‘1’)
128 (WDTIN = ‘1’)
SWR
819.2ms
209.7ms
1.024ms
262.1ms
X
X
X
X
X
X
WDTR
X
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