参数资料
| 型号： | P89LPC972FN,129 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 26/66页 |
| 文件大小： | 0K |
| 描述： | MCU 80C51 8KB FLASH 20DIP |
| 标准包装： | 18 |
| 系列： | LPC900 |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 18MHz |
| 连通性： | I²C，SPI，UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 18 |
| 程序存储器容量： | 8KB（8K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 256 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.4 V ~ 5.5 V |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 其它名称： | 568-8749-5 P89LPC972FN,129-ND |
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P89LPC97X
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 3 — 8 June 2010
32 of 66
NXP Semiconductors
P89LPC970/971/972
8-bit microcontroller with accelerated two-clock 80C51 core
7.22.2 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 7.22.5 “Baud
7.22.3 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 116 or 132 of the CPU clock
frequency, as determined by the SMOD1 bit in PCON.
7.22.4 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
7.22.5 Baud rate generator and selection
The P89LPC970/971/972 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 7). Note
that Timer T1 is further divided by 2 if the SMOD1 bit (PCON.7) is cleared. The
independent baud rate generators use OSCCLK.
7.22.6 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 7.
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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