參數(shù)資料
型號(hào)： P89LPC925
廠商： NXP Semiconductors N.V.
英文描述： 8-bit microcontrollers with accelerated two-clock 80C51 core 4 kB/8 kB 3 V low-power Flash with 8-bit A/D converter
中文描述： 8 -加速雙位單片機(jī)80C51的時(shí)鐘4 KB的核心/ 8 KB的3伏的低功耗Flash 8位A / D轉(zhuǎn)換器
文件頁(yè)數(shù)： 29/49頁(yè)
文件大小： 233K
代理商： P89LPC925
Philips Semiconductors
P89LPC924/925
8-bit microcontrollers with accelerated two-clock 80C51 core
Product data
Rev. 03 — 15 December 2004
29 of 49
9397 750 14471
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
8.19.1
Mode 0
Serial data enters and exits through RxD. TxD outputs the shift clock. 8 bits are
transmitted or received, LSB first. The baud rate is fixed at
1
16
of the CPU clock
frequency.
8.19.2
Mode 1
10 bits are transmitted (through TxD) or received (through RxD): a start bit
(logical ‘0’), 8 data bits (LSB first), and a stop bit (logical ‘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 8.19.5 “Baud rate generator and selection”
).
8.19.3
Mode 2
11 bits are transmitted (through TxD) or received (through RxD): start bit (logical ‘0’),
8 data bits (LSB first), a programmable 9
th
data bit, and a stop bit (logical ‘1’). When
data is transmitted, the 9
th
data bit (TB8 in SCON) can be assigned the value of ‘0’ or
‘1’. Or, for example, the parity bit (P, in the PSW) could be moved into TB8. When
data is received, the 9
th
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.
8.19.4
Mode 3
11 bits are transmitted (through TxD) or received (through RxD): a start bit
(logical ‘0’), 8 data bits (LSB first), a programmable 9
th
data bit, and a stop bit
(logical ‘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
Section 8.19.5 “Baud rate generator and
selection”
).
8.19.5
Baud rate generator and selection
The P89LPC924/925 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 set. The
independent Baud Rate Generator uses OSCCLK.
Fig 7.
Baud rate sources for UART (Modes 1, 3).
Baud Rate Modes 1 and 3
SBRGS = 1
SBRGS = 0
SMOD1 = 0
SMOD1 = 1
2
Timer 1 Overflow
(PCLK-based)
Baud Rate Generator
(CCLK-based)
002aaa419
相關(guān)PDF資料
PDF描述
P89LPC930 8-bit microcontrollers with two-clock 80C51 core 4 kB/8 kB 3 V Flash with 256-byte data RAM
P89LPC933 8-bit microcontroller with accelerated two-clock 80C51 core 4 kB/8 kB 3 V byte-erasable Flash with 8-bit A/D converters
P89LPC934 8-bit microcontroller with accelerated two-clock 80C51 core 4 kB/8 kB 3 V byte-erasable Flash with 8-bit A/D converters
P89LPC935 8-bit microcontroller with accelerated two-clock 80C51 core 4 kB/8 kB 3 V byte-erasable Flash with 8-bit A/D converters
P89LPC935FA 8-bit microcontroller with accelerated two-clock 80C51 core 4 kB/8 kB 3 V byte-erasable Flash with 8-bit A/D converters
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P89LPC9251 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontroller with accelerated two-clock 80C51 core 2 kB/4 kB/8 kB 3 V byte-erasable flash with 8-bit ADC
P89LPC9251FDH 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontroller with accelerated two-clock 80C51 core 2 kB/4 kB/8 kB 3 V byte-erasable flash with 8-bit ADC
P89LPC9251FDH,112 功能描述:8位微控制器 -MCU MCU 8-Bit CISC 8KB Flash2.5V/3.3V 20Pin RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
P89LPC925FDH 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with accelerated two-clock 80C51 core 4 kB/8 kB 3 V low-power Flash with 8-bit A/D converter
P89LPC925FDH,529 功能描述:8位微控制器 -MCU 80C51 8K FL 256B RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*