参数资料
型号: ST10F269DIETR
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, UUC
封装: DIE
文件页数: 11/161页
文件大小: 1595K
代理商: ST10F269DIETR
ST10F269-T3
108/160
Figure 55 : Asynchronous Reset Sequence Internal Fetch
Note: 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
(fCPU =fXTAL / 2), else it is 4 CPU clock cycles (8 TCL).
2) 2.1s typical value.
Power-on reset
The asynchronous reset must be used during the power-on of the MCU. Depending on the crystal frequency,
the on-chip oscillator needs about 10ms to 50ms to stabilize. The logic of the MCU does not need a stabilized
clock signal to detect an asynchronous reset, so it is suitable for power-on conditions. To ensure a proper
reset sequence, the RSTIN pin and the RPD pin must be held at low level until the MCU clock signal is
stabilized and the system configuration value on PORT0 is settled.
Hardware reset
The asynchronous reset must be used to recover from catastrophic situations of the application. It may be
triggered by the hardware of the application. Internal hardware logic and application circuitry are
described in Section 18.6 - Reset Circuitry and Figure 58, Figure 59 and Figure 60.
18.1.2 - Synchronous Reset (RSTIN pulse > 1040TCL and RPD pin at high level)
The synchronous reset is a warm reset. It may be generated synchronously to the CPU clock. To be
detected by the reset logic, the RSTIN pulse must be low at least for 4 TCL (2 periods of CPU clock).
Then the I/O pins are set to high impedance and RSTOUT pin is driven low. After the 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 sequence lasts for 1024 TCL (512 periods of CPU clock). After this duration the pull-down of
RSTIN pin for the bidirectional reset function is released and the RSTIN pin level is sampled. At this step
the sequence lasts 1040 TCL (4 TCL + 12 TCL + 1024 TCL). If the RSTIN pin level is low, the reset
sequence is extended until RSTIN level becomes high. Refer to Figure 56
Note
If VRPD voltage drops below the RPD pin threshold (typically 2.5V for VDD = 5V) when RSTIN pin
is low or when RSTIN pin is internally pulled low, the ST10 reset circuitry disables the bidirectional
reset function and RSTIN pin is no more pulled low. The reset is processed as an asynchronous
reset.
6 or 8 TCL 1)
CPU Clock
RSTIN
Asynchronous
Reset Condition
RPD
RSTOUT
PORT0
Reset Configuration
INTERNAL FETCH
Internal reset signal
Flash read signal
PLL factor
latch command
Flash under reset for internal charge pump ramping up
1st fetch
from Flash
Latching point of PORT0
for PLL configuration
Latching point of PORT0
for remaining bits
12
3
2.5s max.2)
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