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ST10F273E Datasheet(PDF) 20 Page - STMicroelectronics

Part # ST10F273E
Description  16-bit MCU with 512 Kbyte Flash memory and 36 Kbyte RAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F273E Datasheet(HTML) 20 Page - STMicroelectronics

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Pin data
ST10F273E
20/179
XTAL1
138
I
XTAL1 Main oscillator amplifier circuit and/or external clock input.
XTAL2
137
O
XTAL2 Main oscillator amplifier circuit output.
To clock the device from an external source, drive XTAL1 while leaving XTAL2
unconnected. Minimum and maximum high / low and rise / fall times specified in
the AC Characteristics must be observed.
XTAL3
143
I
XTAL3 32 kHz oscillator amplifier circuit input
XTAL4
144
O
XTAL4 32 kHz oscillator amplifier circuit output
When 32 kHz oscillator amplifier is not used, to avoid spurious consumption,
XTAL3 shall be tied to ground while XTAL4 shall be left open. Besides, bit OFF32
in RTCCON register shall be set. 32 kHz oscillator can only be driven by an
external crystal, and not by a different clock source.
RSTIN
140
I
Reset Input with CMOS Schmitt-Trigger characteristics. A low level at this pin for
a specified duration while the oscillator is running resets the ST10F273E. An
internal pull-up resistor permits power-on reset using only a capacitor connected
to VSS. In bidirectional reset mode (enabled by setting bit BDRSTEN in
SYSCON register), the RSTIN line is pulled low for the duration of the internal
reset sequence.
RSTOUT
141
O
Internal Reset Indication Output. This pin is driven to a low level during
hardware, software or watchdog timer reset. RSTOUT remains low until the EINIT
(end of initialization) instruction is executed.
NMI
142
I
Non-Maskable Interrupt Input. A high to low transition at this pin causes the CPU
to vector to the NMI trap routine. If bit PWDCFG = ‘0’ in SYSCON register, when
the PWRDN (power down) instruction is executed, the NMI pin must be low in
order to force the ST10F273E to go into power down mode. If NMI is high and
PWDCFG =’0’, when PWRDN is executed, the part will continue to run in normal
mode.
If not used, pin NMI should be pulled high externally.
VAREF
37
-
A/D converter reference voltage and analog supply
VAGND
38
-
A/D converter reference and analog ground
RPD
84
-
Timing pin for the return from interruptible power down mode and synchronous /
asynchronous reset selection.
VDD
17, 46,
72,82,93,
109, 126,
136
-
Digital supply voltage = + 5V during normal operation, idle and power down
modes.
It can be turned off when Stand-by RAM mode is selected.
VSS
18,45,
55,71,
83,94,
110, 127,
139
-
Digital ground
V18
56
-
1.8V decoupling pin: a decoupling capacitor (typical value of 10nF, max 100nF)
must be connected between this pin and nearest VSS pin.
Table 1.
Pin description (continued)
Symbol
Pin
Type
Function


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