SAK-C505L Infineon Technologies AG, SAK-C505L Datasheet - Page 10

• Manufacturer Part Number: SAK-C505L
• Description: 8-bit CMOS Microcontroller
• Manufacturer: Infineon Technologies AG

Table 1
Pin Definitions and Functions (cont’d)
Symbol
RESET
PSEN
ALE
EA
*) I = Input
Data Sheet
O = Output
Pin Number
43
44
45
46
I/O*)
I
O
O
I
Function
RESET
A high level on this pin for two machine cycles while the
oscillator is running resets the device. An internal diffused
resistor to
external capacitor to
The Program Store Enable
output is a control signal that enables the external program
memory to the bus during external fetch operations. It is
activated every three oscillator periods except during
external data memory accesses. Remains high during
internal program execution. This pin should not be driven
during reset operation.
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 three oscillator periods except during an external data
memory access. When instructions are executed from
internal program memory (EA = 1), the ALE generation can
be disabled by bit EALE in SFR SYSCON. This pin should
not be driven during reset operation.
External Access Enable
This pin must be held at high level. Instructions are fetched
from the internal OTP memory when the PC is less than
8000
memory, when the PC is greater than 7FFF
not be held at low level.
H
. Instructions are fetched from external program
V
8
SS
permits power-on reset using only an
V
DD
.
H
. This pin must
C505L
06.99