peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 39

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

Table 1-6 µP Interface (cont’d)
Pin
No.
100
61
62
63
64
80
81
Note: After reset, IE0 remains in input direction.
Semiconductor Group
Symbol
ALE
IREQ
IACK
IE0
IE1
RESIN
DRESET
In (I)
Out (O)
I
O (OD)
I
I/O
I
O
I
During
Reset
I
“High”
I
I
I
“High”
–
Function
Address Latch Enable
ALE controls the on chip address latch in
multiplexed bus mode. While ALE is “high”, the
latch is transparent. The falling edge latches the
current address.
Interrupt Request is programmable to active
high or low. This signal is activated when the
DOC requests a CPU interrupt. Due to open
drain (OD) characteristic of the output line
multiple interrupt sources can be connected
together.
Interrupt Acknowledge
Interrupt Enable 0,1
Support lines for IACK evaluation;
depends of the selected mode (slave or daisy
chain).
RESet INdication
This pin is set to “high”, when the DOC executes
either a power-up reset, a watchdog timer reset,
an external reset (DRESET) or a software
system reset.
DOC RESET
A “low” forces the DOC into reset state.
1-19
PEB 20560
Overview
2003-08