ST10R272L - DEDICATED PINS
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RSTOUT
Reset Output: provides a special reset signal for external circuitry. RSTOUT is
activated at the beginning of the reset sequence, triggered via RSTIN, a watch-
dog timer overflow or by the SRST instruction. RSTOUT remains active (low)
until the EINIT instruction is executed. This allows to initialize the controller
before the external circuitry is activated
.
XTAL1, XTAL2
Oscillator Input/Output: connect the internal clock oscillator to the external
crystal. An external clock signal may be fed to the input XTAL1, leaving XTAL2
open.
V
CC
, V
SS
Digital Power Supply and Ground (6 pins each): provides the power supply for
the digital logic of the ST10R272L. All V
CC
pins and all V
SS
pins must be con-
nected to the power supply and ground, respectively.
V
PP
/RPD
Flash Programming Voltage for ST10F262 or Exit From Powerdown for all
derivtives
If a Fast External Interrupt pin (EX3IN..EX0IN) is used to Exit From Powerdown
mode, an external RC circuit should be connected to the Vpp/RPD pin. The
discharging of the external capacitor causes a delay that allows the oscillator
and PLL circuits to stabilize before the clock signal is delivered to the CPU and
peripherals, refer to the figure below. For more information on exiting power
down mode refer to“POWER REDUCTION MODES” on page 293.
Figure 50 Vpp external RC ciruit
Pin(s)
Function
Table 24 Summary of dedicated pins (Continued)
Vpp
Vcc
C1
R1
200 K-1 MOhm typical
1µF typical
Vpp external RC circuit for exiting powerdown mode with external
interrupt and for power-up asynchronous reset
ST10R272L
