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ST10F273Z4 Datasheet(PDF) 19 Page - STMicroelectronics

Part # ST10F273Z4
Description  16-bit MCU with 512 Kbyte Flash memory and 36 Kbyte RAM
Download  188 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F273Z4 Datasheet(HTML) 19 Page - STMicroelectronics

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ST10F273Z4
Pin data
19/188
EA / VSTBY
99
I
External access enable pin.
A low level applied to this pin during and after Reset forces the ST10F273Z4 to
start the program from the external memory space. A high level forces
ST10F273Z4 to start in the internal memory space. This pin is also used (when
Stand-by mode is entered, that is ST10F273Z4 under reset and main VDD
turned off) to bias the 32 kHz oscillator amplifier circuit and to provide a
reference voltage for the low-power embedded voltage regulator which
generates the internal 1.8V supply for the RTC module (when not disabled) and
to retain data inside the Stand-by portion of the XRAM (16Kbyte).
It can range from 4.5 to 5.5V (6V for a reduced amount of time during the device
life, 4.0V when RTC and 32 kHz on-chip oscillator amplifier are turned off). In
running mode, this pin can be tied low during reset without affecting 32 kHz
oscillator, RTC and XRAM activities, since the presence of a stable VDD
guarantees the proper biasing of all those modules.
P0L.0 -P0L.7,
P0H.0
P0H.1 - P0H.7
100-107,
108,
111-117
I/O
Two 8-bit bidirectional I/O ports P0L and P0H, bit-wise programmable for input or
output via direction bit. Programming an I/O pin as input forces the
corresponding output driver to high impedance state. The input threshold of
Port 0 is selectable (TTL or CMOS).
In case of an external bus configuration, PORT0 serves as the address (A) and
as the address / data (AD) bus in multiplexed bus modes and as the data (D) bus
in demultiplexed bus modes.
Demultiplexed bus modes
Multiplexed bus modes
P1L.0 - P1L.7
P1H.0 - P1H.7
118-125
128-135
I/O
Two 8-bit bidirectional I/O ports P1L and P1H, bit-wise programmable for input or
output via direction bit. Programming an I/O pin as input forces the
corresponding output driver to high impedance state. PORT1 is used as the 16-
bit address bus (A) in demultiplexed bus modes: if at least BUSCONx is
configured such the demultiplexed mode is selected, the pis of PORT1 are not
available for general purpose I/O function. The input threshold of Port 1 is
selectable (TTL or CMOS).
The pins of P1L also serve as the additional (up to 8) analog input channels for
the A/D converter, where P1L.x equals ANy (Analog input channel y,
where y = x + 16). This additional function have higher priority on demultiplexed
bus function. The following PORT1 pins have alternate functions:
132
I
P1H.4
CC24IO
CAPCOM2: CC24 capture input
133
I
P1H.5
CC25IO
CAPCOM2: CC25 capture input
134
I
P1H.6
CC26IO
CAPCOM2: CC26 capture input
135
I
P1H.7
CC27IO
CAPCOM2: CC27 capture input
Table 2.
Pin description (continued)
Symbol
Pin
Type
Function
Data path width
8-bit
16-bi
P0L.0 – P0L.7:
D0 – D7
D0 - D7
P0H.0 – P0H.7:
I/O
D8 - D15
Data path width
8-bit
16-bi
P0L.0 – P0L.7:
AD0 – AD7
AD0 - AD7
P0H.0 – P0H.7:
A
8 – A15
A
D8 - AD15


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