S2R72V18B10 查看數據表（PDF） - Seiko Epson Corp

零件编号

产品描述 (功能)

生产厂家

S2R72V18B10

S2R72V27

Seiko Epson Corp 

4. Explanation of Functions

4.2 Reset

This LSI includes a hard reset function using the external XRESET terminal and a soft reset function

using register settings.

4.2.1

Hard Reset

Start up from reset status when power is turned on, then cancel the reset after confirming

power on.

4.2.2

Soft Reset

The USB circuits can be reset, or internal USB analog macros can be reset individually, via

software. The ChipReset.AllReset bit initializes all circuits except the CPUIF_MODE

register, or the ChipReset.ResetMTM bit for each port is used to reset individual port USB

analog macros. Note that the USB analog macro should be reset only when in the sleep

state.

4.3 Clock

This LSI incorporates an internal oscillator and feedback resistor (1 MΩ) and supports clock

generation with an external oscillator. The oscillator frequency can be set to 12 MHz or 24 MHz via

register settings.

Fig. 4-2 shows a typical connection configuration for an oscillation circuit. Cd, Cg, and Rd in the

oscillator circuit shown must be matched for the specific oscillator. Contact the oscillator

manufacturer to obtain circuit constants.

Cd

Cg

Rd

XO

XI

Fig. 4-2 Clock generation using the internal oscillator and external oscillator

S2R72V18 Data Sheet (Rev. 1.00)

EPSON

5

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