ST7263BEX datasheet(53/186 Pages) STMICROELECTRONICS

Part #	ST7263BEx

Description	Low speed USB 8-bit MCU family with up to 32 KB Flash/ROM, DFU capability, 8-bit ADC, WDG, timer, SCI and I²C

PDF	186 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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53 / 186 page

ST7263Bxx

Miscellaneous register

Doc ID 7516 Rev 8

53/186

Miscellaneous register

Miscellaneous register (MISCR)

Address: 0009h

Reset value: 0000 0000 (00h)

SMS

USBOE

MCO

Read/write

[7:3]

Reserved

SMS Slow mode Select.

This bit is set by software and only cleared by hardware after a reset. If this

bit is set, it enables the use of an internal divide-by-2 clock divider (refer to

Figure 18 on page 36). The SMS bit has no effect on the USB frequency.

0: Divide-by-2 disabled and CPU clock frequency is standard

1: Divide-by-2 enabled and CPU clock frequency is halved.

USBOE USB enable.

If this bit is set, the port PC2 (PB1 on SO24) outputs the USB output enable

signal (at “1” when the ST7 USB is transmitting data).

Unused bits 7-4 are set.

MCO Main Clock Out selection

This bit enables the MCO alternate function on the PA0 I/O port. It is set and

cleared by software.

0: MCO alternate function disabled (I/O pin free for general-purpose I/O)

1: MCO alternate function enabled (fCPU on I/O port)

ST7263BEx Datasheet(PDF) 53 Page - STMicroelectronics