參數(shù)資料
型號： EM78P451
英文描述： Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Protection Features; Temperature Range: 0&degC to 70°C; Package: 16-QFN
中文描述： 8位微控制器的通用產(chǎn)品[英文]
文件頁數(shù)： 8/52頁
文件大小： 1287K
代理商： EM78P451
EM78P451
OTP ROM
This specification is subject to change without prior notice.
2002/03/01
16
4.3 TCC/WDT Presacler
An 8-bit counter is available as prescaler for the TCC or WDT. The prescaler is available for either the
TCC or WDT only at any given time, and the PAB bit of CONT register is used to determine the
prescaler assignment. The PSR0~PSR2 bits determine the prescale ratio. The prescaler is cleared
each time the instruction is written to TCC under TCC mode. The WDT and prescaler, when assigned to
WDT mode, are cleared by the WDTC or SLEP instructions. Fig. 6 depicts the circuit diagram of
TCC/WDT.
R1(TCC) is an 8-bit timer/counter. TCC will increase by one at every instruction cycle (without
prescaler).
The watchdog timer is a free running on-chip RC oscillator. The WDT will keep running even when the
oscillator driver has been turned off (i.e. in sleep mode). During normal operation or sleep mode, a
WDT time-out (if enabled) will cause the device to reset. The WDT can be enabled or disabled any
time during the normal mode by software programming (if Code Option bit ENWDT is "1"). Refer to
WDTE bit of IOCE register. Without presacler, the WDT time-out period is approximately 18 ms
1.
4.4 I/O Ports
The I/O registers, from Port 5 to Port 9, are bi-directional tri-state I/O ports. P60~P67, P74~P75, and
P90~P91 provide internal pull-high. P60~P67, P74~P75, and P90~P95 provide
programmable
wake-up function through software. P76~P77 can have open-drain output by software control. P80~P81
are the R-option pins which are enabled by software. When the R-option function is used, it is
recommended that P80 and P81 are used as output pins. During R-option enabled state, P80 and P81
must be programmed as input pins. If an external resistor is connected to P80 (P81) for the R-option
function, the current consumption should be taken as an important factor in the applications for low
power consideration.
The I/O ports can be defined as "input" or "output" pins by the I/O control registers (IOC5~IOC9) under
program control. The I/O registers and I/O control registers are both readable and writable. The I/O
interface circuit is shown in Fig. 7. Note that the reading path source of input and output pins is different
when reading the I/O port.
1 NOTE: Vdd = 5V, set up time period = 16.2ms ± 5%
Vdd = 3V, set up time period = 18.0ms ± 5%
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