參數(shù)資料
型號: T9000
廠商: Lineage Power
英文描述: ISDN Network Termination Node (NTN) Device(ISDN網(wǎng)絡(luò)終端節(jié)點器件)
中文描述: ISDN網(wǎng)絡(luò)終端節(jié)點(新界西)設(shè)備(ISDN網(wǎng)網(wǎng)絡(luò)終端節(jié)點器件)
文件頁數(shù): 21/126頁
文件大?。?/td> 1523K
代理商: T9000
Lucent Technologies Inc.
21
Advance Data Sheet
April 2000
ISDN Network Termination Node (NTN) Device
T9000
6 Functional Modules
(continued)
6.7 Clock Generator
This module contains the crystal oscillator, from which it derives clocks to drive the rest of the modules. The micro-
controller can execute a self-powerdown by selecting the clock it receives. At powerup, the microcontroller clock
defaults to 15.36 MHz. The microcontroller can slow down its own clock by writing to the UPCK register. When the
microcontroller is stopped (UPCK[2:0] = 000), any interrupt will immediately set UPCK = 15.36 MHz.
Table 15. UPCK: Microcontroller Clock Control Register (0x03)
Reg
UPCK
RESET
R/W
R/W
Default
Bit 7
CLKOE
1
Bit 6
0
Bit 5
0
Bit 4
0
Bit 3
0
Bit 2
UPCK2
1
Bit 1
UPCK1
1
Bit 0
UPCK0
1
Bit #
7
Symbol
CLKOE
Name/Description
External Microcontroller Clock Output Enable.
Controls the
output driver for the CLKO
signal.
0: Output driver is 3-stated.
1: Output driver is enabled.
Reserved.
Program to 0.
UPCK[2:0]
Microcontroller Clock Value.
Programs the frequency of the microcontroller clock as
follows:
6—3
2—0
000: Stops clock (clock is restarted on detection of interrupt).
001: 0.96 MHz.
010: 1.92 MHz.
011: 3.84 MHz.
100: 7.68 MHz.
101: 15.36 MHz.
110: 15.36 MHz.
111: 15.36 MHz.
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