T89C51AC2-RLSI-M datasheet(16/117 Pages) ATMEL

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T89C51AC2-RLSI-M データシート(PDF) 16 Page - ATMEL Corporation

部品番号	T89C51AC2-RLSI-M

部品情報	8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM

PDF	117 Pages

Scroll/Zoom	100%

メーカー	ATMEL [ATMEL Corporation]

ホームページ	http://www.atmel.com

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16 / 117 page

Draft.A - March 30, 2001

Preview - Confidential

T89C51AC2

Figure 6. Mode Switching Waveforms

The X2 bit in the CKCON register (See Table 7) allows switching from 12 clock cycles per instruction to 6 clock

cycles and vice versa. At reset, the standard speed is activated (STD mode). Setting this bit activates the X2 feature

(X2 mode).

CAUTION

In order to prevent any incorrect operation while operating in the X2 mode, users must be aware that all peripherals

using the clock frequency as a time reference (UART, timers...) will have their time reference divided by two. For

example a free running timer generating an interrupt every 20 ms will then generate an interrupt every 10 ms. A

UART with a 4800 baud rate will have a 9600 baud rate.

XTAL2

XTAL1

CPU clock

X2 bit

X2 Mode

STD Mode

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