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Teilenummer | 80C517A |
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Beschreibung | SAB80C517A | |
Hersteller | Siemens Semiconductor | |
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Gesamt 30 Seiten Microcomputer Components
8-Bit CMOS Single-Chip Microcontroller
SAB 80C517A/83C517A-5
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Data Sheet 05.94
SAB 80C517A/83C517A-5
The pin functions of the SAB 80C517A are identical with those of the SAB 80C517/80C537 with
one exception:
Typ
P-LCC-84, Pin 60
P-MQFP-100-2, Pin 36
SAB 80C517A
HWPD
SAB 80C517/80C537
N.C.
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Pin Configuration
(P-LCC-84)
Semiconductor Group
5
1994-05-01
6 Page SAB 80C517A/83C517A-5
Pin Definitions and Functions (cont’d)
Symbol
Pin Number
I/O *) Function
P-LCC-84 P-MQFP-100-2
XTAL2
39
12
– XTAL2
Input to the inverting oscillator amplifier and
input to the internal clock generator circuits.
XTAL1
40
13
– 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.
P2.0 - P2.7 41 - 48
14 - 21
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I/O 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 (IIL, in the DC 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
issuing1 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.
* I = Input
O = Output
Semiconductor Group
11
1994-05-01
12 Page | ||
Seiten | Gesamt 30 Seiten | |
PDF Download | [ 80C517A Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
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