ST10F273Z4 STMicroelectronics, ST10F273Z4 Datasheet - Page 97

• Manufacturer Part Number: ST10F273Z4
• Description: 16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
• Manufacturer: STMicroelectronics

Specifications of ST10F273Z4

• Single Voltage Supply: 5 V ±10%

ST10F273Z4
20.7
Figure 27. SW / WDT bidirectional RESET (EA=0) followed by a HW RESET
Reset circuitry
Internal reset circuitry is described in
resistor of 50kΩ to 250kΩ (The minimum reset time must be calculated using the lowest
value).
It also provides a programmable (BDRSTEN bit of SYSCON register) pull-down to output
internal reset state signal (synchronous reset, watchdog timer reset or software reset).
This bidirectional reset function is useful in applications where external devices require a
reset signal but cannot be connected to RSTOUT pin.
This is the case of an external memory running codes before EINIT (end of initialization)
instruction is executed. RSTOUT pin is pulled high only when EINIT is executed.
The RPD pin provides an internal weak pull-down resistor which discharges external
capacitor at a typical rate of 200µA. If bit PWDCFG of SYSCON register is set, an internal
pull-up resistor is activated at the end of the reset sequence. This pull-up will charge any
capacitor connected on RPD pin.
The simplest way to reset the ST10F273Z4 is to insert a capacitor C1 between RSTIN pin
and V
RPD pin and V
50kΩ to 250kΩ (the minimum reset time must be determined by the lowest value). Select C1
that produce a sufficient discharge time to permit the internal or external oscillator and / or
internal PLL and the on-chip voltage regulator to stabilize.
RSTIN
RSTF
(After Filter)
P0[15:13]
P0[12:8]
P0[7:2]
P0[1:0]
ALE
RST
RSTOUT
SS
, and a capacitor between RPD pin and V
DD
. The input RSTIN provides an internal pull-up device equalling a resistor of
≤ 500 ns
≥ 50 ns
Figure
not transparent
not transparent
not transparent
1024 TCL
transparent
30. The RSTIN pin provides an internal pull-up
SS
(C0) with a pull-up resistor R0 between
At this time RSTF is sampled LOW
so HW Reset is entered
not t.
not t.
≤ 500 ns
8 TCL
≥ 50 ns
System reset
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