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參數(shù)資料
| 型號： | MC145572APB |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 7/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ISDN INTERFACE TXCVER 44-LQFP |
| 標準包裝： | 160 |
| 類型： | 收發(fā)器 |
| 規(guī)程： | RS232 |
| 電源電壓： | 5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-LQFP |
| 供應(yīng)商設(shè)備封裝： | 44-LQFP（10x10） |
| 包裝： | 托盤 |
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MC145572EVK
16
U-Interface Transceiver. Access to the control registers within the S/T-Interface Transceiver is gained
through the SCP Interface. The registers are displayed and changed via resident software on the
MC145572EVK. A complete description of the S/T-Interface Transceiver registers can be found in Sections
8, 9, and 10 of the MC145574 S/T-Interface Transceiver data sheet.
2.3
MICROCONTROLLERS
The MC145572EVK is an MC68HC705C8 microcontroller-based system. One microcontroller resides on
the board; U15 on the NT1 side which controls both the NT1 and the LT sides. The hardware RESET
push-button is located next to the power supply connection for the microcontroller. U5 must be populated
for the display LEDs to operate properly.
The U-Interface may be activated using an ASCII terminal connected to the EIA-232 (V.28) port marked
J16 on the NT1 side. The board may be activated as it stands alone with the push of a button. The default
activation mode for the Activate/Deactivate push-button, PB2 (located near the front of the board), is as
an NT1, with INFO1 continually transmitted on the S/T-Interface until it receives INFO2. When DIP switch
S4-10 is in the NT1DIS position, the NT1 functionality is disabled. The LT side initiates activation on the
U-Interface. Eight status LEDs (D10, D11, D12, and D13 on LT side and D23, D24, D25, and D26 on the
NT1 side) are continuously updated by the MC68HC705C8s to provide the user with a visual update of
the U-Interface activation status.
When the MC145572EVK is reset, it defaults to NT1 function enabled and automatic handling of M4
maintenance channel on the LT side U-transceiver. The NT1 function can also be disabled by entering the
NOF command. The LT maintenance can be disabled by entering the LOF command. See Section 3.2
for more information on LOF, LON, NOF, and NON commands.
2.3.1
Status LEDs
Ten status LEDs are provided on the MC145572EVK to offer the user a quick visual update to critical
status parameters.
One red LED, D27 on the LT, is located near the power connector and is illuminated when + 5 V is applied
to the board.
One green LED (D31) marked S/T ACT located near the PB2 (ACT/DEA) push button, illuminates to
indicate that the MC145574 when congured as an NT has achieved frame synchronization.
Located on both sides of the board are four LEDs representing Nibble Register 1 (NR1) of each U-Interface
Transceiver.The LEDs in each bank are each marked with LINKUP, EI, SFS, and TP/AIP.They map directly
to the register contents as shown below.
NOTE
The received data is not transmitted on the IDL2 Interface until Linkup is a 1, SFS is a 1,
TP/AIP is a 1, and either CustEn (see NR2 in MC145572 U-Interface Transceiver data
sheet) or VerifAct is a 1 (see BR9 in MC145572 U-Interface Transceiver data sheet).
b3
b2
b1
b0
NR1
Linkup
Error Indication
Superframe Sync
Transparent/
Activation in Progress
NT (LED
Silkscreen)
NT LINKUP
NT EI
NT SFS
NT TP/AIP
LT (LED
Silkscreen)
LT LINKUP
LT EI
LT SFS
LT TP/AIP
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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