C165H Datasheet, PDF (24/499 Pages) Infineon Technologies AG – EMBEDDED C166 WITH USART IOM-2 AND HDLC SUPPORT

C165H
Pin Descriptions
Table 4
IOM-2 Interface Signals
Pin No.
Symbol Input (I)
Function
Output (O)
9
DU
I/O, OD
IOM-2 Data Upstream Signal pin. (From
subscriber to network). For the pin configured
as input, the output driver is put into high-
impedance state. Open-drain.
10
DD
I/O, OD
IOM-2 Data Downstream Signal pin. (From
network to subscriber). For the pin configured
as input, the output driver is put into high-
Y _{impedance state. Open-drain.}
11
DCL
I
IOM-2 Data Clock Signal Input pin
R ₁₂
FSC
I
IOM-2 Frame Sync. Clock Signal Input pin
A _{Table 5}
IN ^{- Pin No.}
T ¹⁵
LIM ^{RP 16}
PRE_{- EXCE} ¹³
Clock Interface Signals
Symbol
Input (I)
Output (O)
XTAL1
I
XTAL2
O
CLKMODE I
Function
External crystal input to the on-chip
oscillator. Clock input for direct driven clock
without using an external crystal. Function is
determined by the CLKMODE pin.
Output from the oscillator amplifier circuit. To
clock the C165H from an external source,
drive XTAL1, while XTAL2 leaving
unconnected. Minimum and maximum high/
low and rise/fall times specified in the AC
characteristics must be observed.
Clock Mode Select pin. CLKMODE must be
set to LOW if an external crystal is used. Set
to HIGH signal enables the direct clock input
path and switches the internal oscillator in
power down mode.
Data Sheet
24
2001-04-19