Datasheet > EM6635WP27

EM6635WP27

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
EMMICRO		振荡器微控制器驱动
页数	文件大小	规格书
39页	794K
描述
Low Power Microcontroller with RC and 32kHz oscillators and 9 high drive outputs

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EM6635WP27 数据手册

EM6635

5.1 Power On Reset

The Power on Reset can be activated by mask option OP-3A.

When the positive power supply VBAT is applied, the internal logic supply voltage VRR rises to the VBAT value with a time

constant given by the filter resistor RFIL and the external capacitor CVRR. The POR cell is active until VRR becomes

higher than the trigger voltage VPOR of the POR cell. The output signal of the POR cell triggers the system reset.

The EM6635 has two oscillation circuits (refer to chapter 6 for the oscillators).

With the metal option OP-20A, the oscillation circuit starts the operating clocks from RC oscillator.

With the metal option OP-20B, the oscillation circuit starts the operating clocks from XTAL oscillator.

With the metal option OP-20C, the input P50 selects the RC oscillator or XTAL oscillator during SYSRES.

A high level at P50 terminal activates the RC oscillator, a low level activates XTAL oscillator.

VBAT

VRR

POROut

P50

Cold start delay

SYSRES

Reset OUT

CPURES

Cold Start flag

EnRc

OscSwitch

RC-Osc

10 Valid Clocks

CPUclk

Xtal32k

CkPerif

Fig.5: Power On Reset Timing and Clock Generation after System starts on the RC Oscillator

03/03 REV. B

www.emmicroelectronic.com

1...4 5 678 9 10...39

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