SAB80C517-M16 SIEMENS [Siemens Semiconductor Group], SAB80C517-M16 Datasheet - Page 273
SAB80C517-M16
Manufacturer Part Number
SAB80C517-M16
Description
8-Bit CMOS Single-Chip Microcontroller
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.SAB80C517-M16.pdf
(323 pages)
- Current page: 273 of 323
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Pin Definitions and Functions (cont’d)
Symbol
XTAL2
XTAL1
P2.0 - P2.7
*
Semiconductor Group
I = Input
O = Output
P-LCC-84
39
40
41 - 48
Pin Number
P-MQFP-100-2
12
13
14 - 21
274
I/O
–
–
I/O
*)
Function
XTAL2
Input to the inverting oscillator amplifier
and input to the internal clock generator
circuits.
XTAL1
Output of the inverting oscillator
amplifier. To drive the device from an
external clock source, XTAL2 should
be driven, while XTAL1 is left
unconnected. There are no
requirements on the duty cycle of the
external clock signal, since the input to
the internal clocking circuitry is devided
down by a divide-by-two flip-flop.
Minimum and maximum high and low
times as well as rise/fall times specified
in the AC characteristics must be
observed.
Port 2
is a bidirectional I/O port with internal
pull-up resistors. Port 2 pins that have
1 s written to them are pulled high by
the internal pull-up resistors, and in that
state can be used as in-puts. As inputs,
port 2 pins being externally pulled low
will source current (I
characteristics) because of the internal
pull-up resistors. Port 2 emits the high-
order address byte during fetches from
external program memory and during
accesses to external data memory that
use 16-bit addresses (MOVX @DPTR).
In this application it uses strong
internal pull-up resistors when issuing
1 s. During accesses to external data
memory that use 8-bit addresses
(MOVX @Ri), port 2 issues the
contents of the P2 special function
register.
SAB 80C517/80C537
IL
, in the DC
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