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| 型號(hào)： | AT80C31X2-SLSUL |
| 廠(chǎng)商： | Atmel |
| 文件頁(yè)數(shù)： | 41/42頁(yè) |
| 文件大小： | 0K |
| 描述： | IC 8031 MCU ROMLESS 44PLCC |
| 標(biāo)準(zhǔn)包裝： | 972 |
| 系列： | 80C |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 30/20MHz |
| 連通性： | UART/USART |
| 外圍設(shè)備： | POR |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲(chǔ)器類(lèi)型： | ROMless |
| RAM 容量： | 128 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 44-LCC（J 形引線(xiàn)） |
| 包裝： | 管件 |
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8
4428E–8051–02/08
AT/TS80C31X2
Figure 6-2.
Mode Switching Waveforms
The X2 bit in the CKCON register (See Table 6-1.) allows to switch from 12 clock cycles per
instruction to 6 clock cycles and vice versa. At reset, the standard speed is activated (STD
mode). Setting this bit activates the X2 feature (X2 mode).
CAUTION
In order to prevent any incorrect operation while operating in X2 mode, user must be aware that
all peripherals using clock frequency as time reference (UART, timers) will have their time refer-
ence divided by two. For example a free running timer generating an interrupt every 20 ms will
then generate an interrupt every 10 ms. UART with 4800 baud rate will have 9600 baud rate.
Reset Value = XXXX XXX0b
Not bit addressable
For further details on the X2 feature, please refer to ANM072 available on the web
(http://www.atmel-wm.com)
XTAL1:2
XTAL1
CPU clock
X2 bit
X2 Mode
STD Mode
Table 6-1.
CKCON Register
CKCON - Clock Control Register (8Fh)
7
6
5
4
3
2
1
0
-
X2
Bit
Number
Bit
Mnemonic
Description
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
2
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
1
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0
X2
CPU and peripheral clock bit
Clear to select 12 clock periods per machine cycle (STD mode, F
OSC=FXTAL/2).
Set to select 6 clock periods per machine cycle (X2 mode, F
OSC=FXTAL).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT80C31X2-SLSUM | 功能描述:8位微控制器 -MCU MICRO RLESS 31X2 40MHZ 5V C. RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)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 |
| AT80C31X2-SLSUV | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:8-bit CMOS Microcontroller ROMless |
| AT80C32-12 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:8-Bit Microcontroller |
| AT80C32-12R | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:8-Bit Microcontroller |
| AT80C32-16 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:8-Bit Microcontroller |
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