ST10F269-T3 STMicroelectronics, ST10F269-T3 Datasheet - Page 109

• Manufacturer Part Number: ST10F269-T3
• Manufacturer: STMicroelectronics

Specifications of ST10F269-T3

• Cpu Family: ST10
• Device Core Size: 16b
• Frequency (max): 32MHz
• Interface Type: ASC/I2C/SSC
• Program Memory Type: Flash
• Program Memory Size: 256KB
• Total Internal Ram Size: 12KB
• # I/os (max): 111
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 16-chx10-bit
• Instruction Set Architecture: CISC/RISC
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 144
• Package Type: TQFP
• Lead Free Status / Rohs Status: Supplier Unconfirmed

Figure 56 : Synchronous Reset Sequence External Fetch (RSTIN pulse > 1040 TCL)
Note
18.1.3 - Exit of Long Hardware Reset
- If the RPD pin level is low when the RSTIN pin is sampled high, the MCU completes an
asynchronous reset sequence.
- If the RPD pin level is high when the RSTIN pin is sampled high, the MCU completes a
synchronous reset sequence.
The system configuration is latched from PORT0 after a duration of 8 TCL / 4 CPU clocks (6 TCL / 3 CPU
clocks if PLL is bypassed) and in case of external fetch, ALE, RD and R/W pins are driven to their inactive
level. The MCU starts program execution from memory location 00'0000h in code segment 0. This
starting location will typically point to the general initialization routine. Refer to Table 29 for PORT0
latched configuration.
18.2 - Short Hardware Reset
A short hardware reset is a warm reset. It may be generated synchronously to the CPU clock
(synchronous reset).
The short hardware is triggered when RSTIN signal duration is shorter or equal to 1038 TCL, the
RPD pin must be pulled high.
To properly activate the internal reset logic of the MCU, the RSTIN pin must be held low, at least, during 4
TCL (2 periods of CPU clock). The I/O pins are set to high impedance and RSTOUT pin is driven low. After
RSTIN level is detected, a short duration of 12 TCL (6 CPU clocks) maximum elapses, during which
pending internal hold states are cancelled and the current internal access cycle if any is completed.
External bus cycle is aborted. The internal pull-down of RSTIN pin is activated if bit BDRSTEN of
SYSCON register was previously set by software. This bit is always cleared on power-on or after any
reset sequence.
The internal reset sequence starts for 1024 TCL (512 periods of CPU clock).
After that duration the pull-down of RSTIN pin for the bidirectional reset function is released and the
RSTIN pin level is sampled high while RPD level is high.
CPU Clock
RSTIN
RPD
RSTOUT
ALE
RD
PORT0
Internal reset signal
1) RSTIN rising edge to internal latch of PORT0 is 3 CPU clock cycles (6 TCL) if the PLL is bypassed and the prescaler is on
(f
2) RSTIN pin is pulled low if bit BDRSTEN (bit 3 of SYSCON register) was previously set by software. Bit BDRSTEN is cleared after
reset.
3) If during the reset condition (RSTIN low), V
ST10 reset circuitry disables the bidirectional reset function and RSTIN pin is no more pulled low.
CPU
= f
XTAL
/ 2), else it is 4 CPU clock cycles (8 TCL).
4 TCL
min.
200µA Discharge
12 TCL
max.
Internally pulled low
1024 TCL
RPD
voltage drops below the threshold voltage (typically 2.5V for 5V operation), the
If V
Reset is not entered.
RPD
Reset Configuration
2)
> 2.5V Asynchronous
3)
1
6 or 8 TCL
2
3
4
1)
5
for system start-up configuration
Latching point of PORT0
5 TCL
6
7
8
9
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