參數(shù)資料
型號: P89LPC9321FN,112
廠商: NXP Semiconductors
文件頁數(shù): 30/71頁
文件大小: 0K
描述: IC 80C51 MCU FLASH 8K 28-DIP
產(chǎn)品培訓(xùn)模塊: LPC9351/9321 Overview
標(biāo)準(zhǔn)包裝: 13
系列: LPC900
核心處理器: 8051
芯體尺寸: 8-位
速度: 18MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 26
程序存儲器容量: 8KB(8K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 512 x 8
RAM 容量: 768 x 8
電壓 - 電源 (Vcc/Vdd): 2.4 V ~ 3.6 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-DIP(0.600",15.24mm)
包裝: 管件
配用: 568-4000-ND - DEMO BOARD SPI/I2C TO DUAL UART
568-3510-ND - DEMO BOARD SPI/I2C TO UART
622-1003-ND - KIT FOR LCD DEMO
568-1759-ND - EMULATOR DEBUGGER/PROGRMMR LPC9X
568-1758-ND - BOARD EVAL FOR LPC93X MCU FAMILY
其它名稱: 568-4700-5
935287657112
P89LPC9321FN
P89LPC9321
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 2 — 16 November 2010
36 of 71
NXP Semiconductors
P89LPC9321
8-bit microcontroller with accelerated two-clock 80C51 core
7.23.2 Mode 1
10 bits are transmitted (through TXD) or received (through RXD): a start bit (logic 0),
8 data bits (LSB first), and a stop bit (logic 1). When data is received, the stop bit is stored
in RB8 in special function register SCON. The baud rate is variable and is determined by
the Timer 1 overflow rate or the baud rate generator (described in Section 7.23.5 “Baud
7.23.3 Mode 2
11 bits are transmitted (through TXD) or received (through RXD): start bit (logic 0), 8 data
bits (LSB first), a programmable 9th data bit, and a stop bit (logic 1). When data is
transmitted, the 9th data bit (TB8 in SCON) can be assigned the value of logic 0 or logic 1.
Or, for example, the parity bit (P, in the PSW) could be moved into TB8. When data is
received, the 9th data bit goes into RB8 in special function register SCON, while the stop
bit is not saved. The baud rate is programmable to either 1
16 or
1
32 of the CPU clock
frequency, as determined by the SMOD1 bit in PCON.
7.23.4 Mode 3
11 bits are transmitted (through TXD) or received (through RXD): a start bit (logic 0), 8
data bits (LSB first), a programmable 9th data bit, and a stop bit (logic 1). In fact, Mode 3 is
the same as Mode 2 in all respects except baud rate. The baud rate in Mode 3 is variable
and is determined by the Timer 1 overflow rate or the baud rate generator (described in
7.23.5 Baud rate generator and selection
The P89LPC9321 enhanced UART has an independent baud rate generator. The baud
rate is determined by a baud-rate preprogrammed into the BRGR1 and BRGR0 SFRs
which together form a 16-bit baud rate divisor value that works in a similar manner as
Timer 1 but is much more accurate. If the baud rate generator is used, Timer 1 can be
used for other timing functions.
The UART can use either Timer 1 or the baud rate generator output (see Figure 12). Note
that Timer T1 is further divided by 2 if the SMOD1 bit (PCON.7) is cleared. The
independent baud rate generators use OSCCLK.
7.23.6 Framing error
Framing error is reported in the status register (SSTAT). In addition, if SMOD0 (PCON.6)
is logic 1, framing errors can be made available in SCON.7 respectively. If SMOD0 is
logic 0, SCON.7 is SM0. It is recommended that SM0 and SM1 (SCON.7:6) are set up
when SMOD0 is logic 0.
Fig 12. Baud rate sources for UART (Modes 1, 3)
baud rate modes 1 and 3
SBRGS = 1
SBRGS = 0
SMOD1 = 0
SMOD1 = 1
timer 1 overflow
(PCLK-based)
baud rate generator
(CCLK-based)
002aaa897
÷2
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