参数资料
型号: W78E858A40PL
厂商: Nuvoton Technology Corporation of America
文件页数: 17/35页
文件大小: 0K
描述: IC MCU 8-BIT 32K FLASH 44-PLCC
标准包装: 30
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-PLCC
包装: 管件
W78E858
5.20 Programmable Clock-out
A 50% duty cycle clock can be programmed to come out on P1.0. To configure the timer/counter2 as a
clock generator, bit C/T2 in T2CON register must be cleared and bit T2OE in T2MOD register must be
set. Bit TR2 (T2CON.2) also must be set to start timer. The clock-out frequency depends on the
oscillator frequency and reload value of Timer2 capture register (RCAP2H, RCAP2L) as shown in this
equation:
))
2
,
2
(
65536
(
4
L
RCAP
H
RCAP
frequency
r
oscillatot
×
In the clock-out mode, timer2 roll-overs will not generate an interrupt. This is similar to when it is used
as a baud-rate generator. It is possible to use Timer2 as a baud-rate generator and a clock and a
clock generator simultaneously.
5.21 Reduce EMI Emission
The transition of ALE will cause noise, so it cab be turned off to reduce the EMI emission if it is
useless. Turn off the ALE signal transition only need too set the ALEOFF flag in the AUXR register
When ALE is turned off, it will be reactived when program access external ROM or RAM data or jump
to execute external ROM code. After access completely or program returns to internal ROM code, ALE
signal will turn off again.
PRESCALER
14-BIT TIM ER
EXTERNAL RESET
SYSTEM RESET
ENW
WIDL
IDLE
Fosc
1/12
CLRW
Fig. 17-BIT W atch-Dog Tim er Function Block Diagram
Publication Release Date: April 22, 2008
- 24 -
Revision A8
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