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PDF SAF-C502-2RN Data sheet ( Hoja de datos )

Número de pieza SAF-C502-2RN
Descripción 8-Bit CMOS Microcontroller
Fabricantes Siemens Semiconductor Group 
Logotipo Siemens Semiconductor Group Logotipo



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No Preview Available ! SAF-C502-2RN Hoja de datos, Descripción, Manual

Microcomputer Components
8-Bit CMOS Microcontroller
C502
Data Sheet 08.94

1 page




SAF-C502-2RN pdf
Pin Configuration
(top view)
(P-LCC-44)
C502
Semiconductor Group
4

5 Page





SAF-C502-2RN arduino
C502
Pin Definitions and Functions (cont’d)
Symbol
RESET
ALE
EA
P0.0 – P0.7
VSS
VCC
N.C.
Pin Number
P-LCC-44 P-DIP-40
10 9
33 30
35 31
43–36
39–32
22
44
1, 12,
23, 34
20
40
I/O*) Function
I RESET
A high level on this pin for two machine cycles
while the oscillator is running resets the
device. An internal diffused resistor to VSS
permits power-on reset using only an external
capacitor to VCC.
O The Address Latch Enable
output is used for latching the low-byte of the
address into external memory during normal
operation. It is activated every six oscillator
periodes except during an external data
memory access.
I External Access Enable
When held at high level, instructions are
fetched from the internal ROM (SAB-C502-2R
only) when the PC is less than 4000H. When
held at low level, the SAB-C502 fetches all
instructions from external program memory.
For the SAB-C502-L this pin must be tied low.
I/O Port 0
is an 8-bit open-drain bidirectional I/O port.
Port 0 pins that have 1s written to them float,
and in that state can be used as high-
impedance inputs. Port 0 is also the
multiplexed low-order address and data bus
during accesses to external program or data
memory. In this application it uses strong
internal pull-up resistors when issuing 1s.
Port 0 also outputs the code bytes during
program verification in the SAB-C502-2R.
External pull-up resistors are required during
program verification.
Circuit ground potential
Supply terminal for all operating modes
No connection
*) I = Input
O = Output
Semiconductor Group
10

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