ST10F166 datasheet(5/62 Pages) STMICROELECTRONICS

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ST10F166

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Table 1. Pin Definition and Function

Symbol

Number

Input (I)

Output (O)

Function

P4.0 –

P4.1

16 - 17

I/O

Port 4 is a 2-bit bidirectional I/O port. It is bit-wise programmable

for input or output via direction bits. For a pin configured as input,

the output driver is put into high-impedance state.

In case of an external bus configuration, Port 4 can be used to

output the segment address lines:

P4.0A16Least Significant Segment Addr. Line

P4.1A17Most Significant Segment Addr. Line

XTAL1

XTAL2

XTAL1:Input to the oscillator amplifier and input to the internal

clock generator

XTAL2:Output of the oscillator amplifier circuit.

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 ob-

served.

BUSACT,

EBC1,

EBC0

VPP

External Bus Configuration selection inputs. These pins are sam-

pled during reset and select either the single chip mode or one of

the four external bus configurations:

BUSACTEBC1EBC0Mode/Bus Configuration

8-bit demultiplexed bus

8-bit multiplexed bus

16-bit muliplexed bus

16-bit demultiplexed bus

Single chip mode

Reserved.

After reset pin EBC1 accepts the programming voltage for the

Flash Memory as an “alternate function”:

Flash Memory Programming Voltage VPP =12 V.

RSTIN

Reset Input with Schmitt-Trigger characteristics. A low level at

this pin for a specified duration while the oscillator is running re-

sets the ST10R165. An internal pullup resistor permits power-on

reset using only a capacitor connected to V

SS.

RSTOUT

Internal Reset Indication Output. This pin is set to a low level

when the part is executing either a hardware-, a software- or a

watchdog timer reset. RSTOUT remains low until the EINIT (end of

initialization) instruction is executed.

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