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SAB88C166 Datasheet(Hoja de datos) 5 Page - Siemens Semiconductor Group

No. de Pieza. SAB88C166
Descripción  16-Bit CMOS Single-Chip Microcontrollers with/without oscillator prescaler with 32 KByte Flash EPROM
Descarga  58 Pages
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Fabricante  SIEMENS [Siemens Semiconductor Group]
Página de inicio  http://www.siemens.com/
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SAB 88C166(W)
Semiconductor Group
4
Pin Definitions and Functions
Symbol
Pin
Number
Input (I)
Output (O)
Function
P4.0 –
P4.1
16 - 17
16
17
I/O
O
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:
P4.0
A16
Least Significant Segment Addr. Line
P4.1
A17
Most Significant Segment Addr. Line
XTAL1
XTAL2
20
19
I
O
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 observed.
BUSACT,
EBC1,
EBC0
VPP
22
23
24
23
I
I
I
External Bus Configuration selection inputs. These pins are
sampled during reset and select either the single chip mode
or one of the four external bus configurations:
BUSACT EBC1
EBC0
Mode/Bus Configuration
0
0
0
8-bit demultiplexed bus
0
0
1
8-bit multiplexed bus
0
1
0
16-bit muliplexed bus
0
1
1
16-bit demultiplexed bus
1
0
0
Single chip mode
1
0
1
Reserved.
1
1
0
Reserved.
1
1
1
Reserved.
After reset pin EBC1 accepts the programming voltage for the
Flash EPROM as an “alternate function”:
Flash EPROM Programming Voltage VPP = 12 V.
RSTIN
27
I
Reset Input with Schmitt-Trigger characteristics. A low level at
this pin for a specified duration while the oscillator is running
resets the SAB 88C166(W). An internal pullup resistor permits
power-on reset using only a capacitor connected to
V
SS.
RSTOUT 28
O
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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