參數(shù)資料
型號(hào)： T9000
英文描述： ISDN Network Termination Node (NTN) Device
中文描述： ISDN網(wǎng)絡(luò)終端節(jié)點(diǎn)（新界北）設(shè)備
文件頁數(shù)： 12/126頁
文件大?。?/td> 2127K
代理商： T9000
12
Lucent Technologies Inc.
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
T9000
4 Pin Information
(continued)
Table 5. 80C32 External Access Pins (27)
(continued)
* I = input, O = output, HZ = high-impedance, OD = open-drain output, I
d
= input with an internal 50 k
pull-down, I
U
= input with an internal
100 k
pull-up.
Pin Name
XINT1
Pin #
100
Type*
I
Pin Description
External Interrupt 1 (Active-Low).
Input for driving external interrupt #1 signal on
80C32. This signal is fed to the UCI module where it is collapsed with the rest of the
type 1 interrupts from the internal NTN circuitry (i.e., those in register GIR1), and the
result is presented to the 80C32 INT1_B input.
ONCE mode
. Interrupt source 1 output. Open-drain output. The UCI module drives
this signal low whenever an internal interrupt type 1 condition occurs.
Microcontroller Clock Output.
Outputs clock based on settings in register UPCK
(see Section 6.7, Clock Generator).
ONCE mode
. Same behavior as in normal mode. Can be used to supply clock to
external emulator.
Internal Microsleep Input (Active-Low).
Activates ONCE mode when
SLP
is low
upon an exit from RESET. Internal 100 k
pull-up.
ONCE mode
. Same behavior as in normal mode. Internal pull-up.
80C32 Serial Input Port.
Connected directly to P3.0 of 80C32 block. Can also be
used as a programmable I/O by appropriate programming of the SFR direction
register DIR3 and the SFR port register P3. Internal 50 k
pull-down.
ONCE mode
. RXD is 3-stated.
80C32 Serial Output Port.
Connected directly to P3.1 of 80C32 block. Can also
be used as a programmable I/O by appropriate programming of the SFR direction
register DIR3 and the SFR port register P3 (see Section 6.12, Special Instructions
for Using the Lucent 80C32 Block). Internal 50 k
pull-down.
ONCE mode
. TXD is 3-stated.
External Access (Active-Low).
When
EA
is held high, the microcontroller executes
instructions from the internal program memory. Holding
EA
low forces the microcon-
troller to execute instructions from external program memory. Internal 100 k
pull-
up.
ONCE mode
. Holding
EA
low disables access to the internal memory in the NTN
device.
—
OD
CLKO
24
O
—
O
SLP
21
I
U
—
26
I
U
I
d
RXD
—
23
HZ
I
d
TXD
—
70
HZ
I
EA
—
I
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