参数资料
| 型号： | COP8CCR9LVA8 |
| 厂商： | National Semiconductor |
| 文件页数： | 76/111页 |
| 文件大小： | 0K |
| 描述： | IC MCU EEPROM 8BIT 68-PLCC |
| 标准包装： | 18 |
| 系列： | COP8™ 8C |
| 核心处理器： | COP8 |
| 芯体尺寸： | 8-位 |
| 速度： | 20MHz |
| 连通性： | Microwire/Plus（SPI），UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 59 |
| 程序存储器容量： | 32KB（32K x 8） |
| 程序存储器类型： | 闪存 |
| 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 16x10b |
| 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： | 管件 |
| 其它名称： | *COP8CCR9LVA8 |
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SNOS535I – OCTOBER 2000 – REVISED MARCH 2013
Where:
BR is the Baud Rate
FC is the crystal frequency
N is the Baud Rate Divisor (Table 5-16)
P is the Prescaler Divide Factor selected by the value in the Prescaler Select Register (Table 5-17)
NOTE
In the Synchronous Mode, the divisor 16 is replaced by two.
Example:
Asynchronous Mode:
Crystal Frequency = 5 MHz
Desired baud rate = 19200
Using the above equation N × P can be calculated first.
N × P = (5 x 10
6 x 2)/(16 x 19200) = 32.552
Now 32.552 is divided by each Prescaler Factor (Table 5-17) to obtain a value closest to an integer. This
factor happens to be 6.5 (P = 6.5).
N = 32.552/6.5 = 5.008 (N = 5)
The programmed value (from Table 5-16) should be 4 (N - 1).
Using the above values calculated for N and P:
BR = (5 x 10
6 x 2)/(16 x 5 x 6.5) = 19230.769
error = (19230.769 - 19200) x 100/19200 = 0.16%
Figure 5-19. USART BAUD Clock Divisor Registers
5.13.8 EFFECT OF HALT/IDLE
The USART logic is reinitialized when either the HALT or IDLE modes are entered. This reinitialization
sets the TBMT flag and resets all read only bits in the USART control and status registers. Read/Write bits
remain unchanged. The Transmit Buffer (TBUF) is not affected, but the Transmit Shift register (TSFT) bits
are set to one. The receiver registers RBUF and RSFT are not affected.
The device will exit from the HALT/IDLE modes when the Start bit of a character is detected at the RDX
(L3) pin. This feature is obtained by using the Multi-Input Wake-up scheme provided on the device.
Before entering the HALT or IDLE modes the user program must select the Wake-up source to be on the
RDX pin. This selection is done by setting bit 3 of WKEN (Wake-up Enable) register. The Wake-up trigger
condition is then selected to be high to low transition. This is done via the WKEDG register (Bit 3 is one).
If the device is halted and crystal oscillator is used, the Wake-up signal will not start the chip running
immediately because of the finite start up time requirement of the crystal oscillator. The idle timer (T0)
generates a fixed (256 tC) delay to ensure that the oscillator has indeed stabilized before allowing the
device to execute code. The user has to consider this delay when data transfer is expected immediately
after exiting the HALT mode.
Copyright 2000–2013, Texas Instruments Incorporated
Functional Description
67
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