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参数资料
| 型号： | W78E858A40FL |
| 厂商： | Nuvoton Technology Corporation of America |
| 文件页数： | 3/35页 |
| 文件大小： | 0K |
| 描述： | IC MCU 8-BIT 32K FLASH 44-PQFP |
| 标准包装： | 96 |
| 系列： | W78 |
| 核心处理器： | 8052 |
| 芯体尺寸： | 8-位 |
| 速度： | 40MHz |
| 连通性： | EBI/EMI，串行端口 |
| 外围设备： | POR，PWM，WDT |
| 输入/输出数： | 36 |
| 程序存储器容量： | 32KB（32K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 768 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振荡器型： | 内部 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 44-BQFP |
| 包装： | 托盘 |
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W78E858
Publication Release Date: April 22, 2008
- 11 -
Revision A8
5.5 Timers 0, 1, and 2
Timers 0, 1, and 2 each consist of two 8-bit data registers. These are called TL0 and TH0 for Timer 0,
TL1 and TH1 for Timer 1, and TL2 and TH2 for Timer 2. The TCON and TMOD registers provide
control functions for timers 0, 1. The T2CON register provides control functions for Timer 2. RCAP2H
and RCAP2L are used as reload/capture registers for Timer 2.
The operations of Timer 0 and Timer 1 are the same as in the W78C51. Timer 2 is a 16-bit
timer/counter that is configured and controlled by the T2CON register. Like Timers 0 and 1, Timer 2
can operate as either an external event counter or as an internal timer, depending on the setting of bit
C/T2 in T2CON. Timer 2 has three operating modes: capture, auto-reload, and baud rate generator.
The clock speed at capture or auto-reload mode is the same as that of Timers 0 and 1.
5.6 Clock
The W78E858 is designed to use with either a crystal oscillator or an external clock. Internally, the
clock is divided by two before it is used by default. This makes the W78E858 relatively insensitive to
duty cycle variations in the clock.
5.7 Crystal Oscillator
The W78E858 incorporates a built-in crystal oscillator. To make the oscillator work, a crystal must be
connected across pins XTAL1 and XTAL2. In addition, a load capacitor must be connected from each
pin to ground, and a resistor must also be connected from XTAL1 to XTAL2 to provide a DC bias
when the crystal frequency is above 24 MHz.
5.8 External Clock
An external clock should be connected to pin XTAL1. Pin XTAL2 should be left unconnected. The
XTAL1 input is a CMOS-type input, as required by the crystal oscillator. As a result, the external clock
signal should have an input one level of greater than 3.5 volts.
5.9 Power Management
5.9.1
Idle Mode
The CPU will enter to idle by setting the IDL bit in the PCON register. In the idle mode, the internal
clock to the processor is stopped. The peripherals and the interrupt logic continue to be clocked. The
processor will exit idle mode when either an interrupt or a reset occurs.
5.9.2
Power-down Mode
When the PD bit of the PCON register is set, the processor enters the power-down mode. In this mode
all of the clocks, including the oscillator are stopped. There are two ways to exit power-down mode,
one is by a chip reset and another is via external interrupts wake up if the related control flags are
enabled.
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相关代理商/技术参数 |
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| W78E858A40PL | 功能描述:IC MCU 8-BIT 32K FLASH 44-PLCC RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:W78 标准包装:250 系列:80C 核心处理器:8051 芯体尺寸:8-位 速度:16MHz 连通性:EBI/EMI，I²C，UART/USART 外围设备:POR，PWM，WDT 输入/输出数:40 程序存储器容量:- 程序存储器类型:ROMless EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4.5 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-LCC（J 形引线） 包装:带卷 (TR) |
| W78ERD2 | 制造商:WINBOND 制造商全称:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78ERD2_07 | 制造商:WINBOND 制造商全称:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78ERD2A | 制造商:WINBOND 制造商全称:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78ERD2A40DL | 功能描述:IC MCU 8-BIT 64K FLASH 40-DIP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:W78 标准包装:300 系列:78K0R/Ix3 核心处理器:78K/0R 芯体尺寸:16-位 速度:40MHz 连通性:3 线 SIO，I²C，LIN，UART/USART 外围设备:DMA，LVD，POR，PWM，WDT 输入/输出数:27 程序存储器容量:16KB（16K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:1K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:38-SSOP 包装:托盘 |
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