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MC68302AG16C 产品描述及参数 - NXP（恩智浦）
制造商:
NXP（恩智浦）
分类:
微处理器
封装:
LQFP-144
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MC68302AG16C数据手册
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page 6
MC68302 AutoBaud Specificati
o
n - Rev.2.0
used to provide the correct frequency for transmission. The user needs to provide the sampling
clock that will be used for the AutoBaud function on the RCLK pin (for example, a 1.8432 MHz
clock for 115.2K). The clock that will be used for the SCC transmission can be provided to the
BRG from the system clock or on TIN1.The TIN1 and RCLK1 pins can be tied together
externally. After the first two characters have been received and character length and parity
determined, the host programs the DSR to $FFFF, enables the transmitter (by setting ENT), and
programs the transmit character descriptor (overlays CONTROL Character 8). The host is
interrupted after each character is transmitted.
1.4 Autobaud Parameter RAM
When configured to operate in the AutoBaud mode, the MC68302 overlays some entries of the
UART-Specific Parameter RAM as illustrated in Table 1 on page 6.
*– These values should be initialized by the user (M68000 core).
Note the new parameters that have been added to the table. They are MAX_BIT,
NOM_START, ABCHR1, ABCHR2, RxPTR (2 words), and TxBD. These parameters are of
special importance to the AutoBaud controller. They must be written prior to issuing the
Enter_Baud_Hunt command.
Table 1. AutoBaud Specific Parameter
Address Name Width Description
SCC Base + 9C * MAX_IDL Word Maximum IDLE Characters
SCC Base + 9E MAX_BIT Word Current Maximum Start Bit Length
SCC Base + A0 NOM_START Word Current Nom. Start Bit (used to determine baudrate)
SCC Base + A2 * PAREC Word Receive Parity Error Counter
SCC Base + A4 * FRMEC Word Receive Framing Error Counter
SCC Base + A6 * NOSEC Word Receive Noise Counter
SCC Base + A8 * BRKEC Word Receive Break Error Counter
SCC Base + AA * ABCHR1 Word User Defined Character1
SCC Base + AC * ABCHR2 Word User Defined Character2
SCC Base + AE RCCR Word Receive Control Character Register
SCC Base + B0 * CHARACTER1 Word CONTROL Character1
SCC Base + B2 * CHARACTER2 Word CONTROL Character2
SCC Base + B4 * CHARACTER3 Word CONTROL Character3
SCC Base + B6 * CHARACTER4 Word CONTROL Character4
SCC Base + B8 * CHARACTER5 Word CONTROL Character5
SCC Base + BA * CHR6/RxPTR Word CONTRChar6/MSW of pointer to external Rx Buffer
SCC Base + BC * CHR7RxPTR Word CONTRChar7/LSW of pointer to external Rx Buffer
SCC Base + BE * CHR8/TxBD Word CONTROL Character8/Transmit BD
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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