Intel 8xC251TB User Manual

Release Date: December 2003Order Number: 273138-002The 8xC251Tx may contain design defects or errors known as errata which may cause the product to de

8xC251Tx Hardware Description4P3.0 P3.1 P3.2 P3.3 P3.4 P3.5 P3.6 P3.7I/O Port 3. This is an 8 bit, bidirectional I/O port with internal pullups RXD TX

58xC251Tx Hardware DescriptionVCC2PWR Secondary Supply Voltage 2. This supply voltage connection is pro-vided to reduce power supply noise. Connection

8xC251Tx Hardware Description6Table 3. Special Function Register (SFR) Map F8CH00000000CCAP0HxxxxxxxxCCAP1HxxxxxxxxCCAP2HxxxxxxxxCCAP3HxxxxxxxxCCAP4Hx

78xC251Tx Hardware Description3.0 THE SECOND SERIAL I/O PORTThe second serial I/O port is functionally the same as the standard serial I/O port shared

8xC251Tx Hardware Description8The second serial I/O port interrupt is enabled by setting the ES1 bit in the IE1 register. The priority of the second s

98xC251Tx Hardware Description3.2 Special Function Register DefinitionsThe following describes the special function registers associated with the seco

8xC251Tx Hardware Description103.2.2 SBUF1Address: 9BH Reset Value: xxxx xxxxBTo send serial data, software writes a byte to SBUF1 and to receive seri

118xC251Tx Hardware Description3.2.6 IE1Address: B1H Reset Value: xxxx xxx0B3.2.7 IPH1Address: B3H Reset Value: xxxx xxx0B3.2.8 IPL1Address: B2H Reset

8xC251Tx Hardware Description124.0 EXTENDED DATA FLOAT TIMINGThe Extended Data Float Timing feature seeks to provide a solution to users that may be u

138xC251Tx Hardware DescriptionTable 13 shows the effect of programming EDF# and WSB#[1:0] on the extended data float timing feature as well as the in

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273138-002 December 2003 iii8xC251Tx Hardware DescriptionREVISION HISTORY:Date Revision DescriptionNovember 1997 001 Initial release of this documentD

iv December 2003 273138-0028xC251Tx Hardware Description

273138-002 December 2003 v8xC251Tx Hardware Description8xC251TB, 8xC251TQ Hardware DescriptionAddendum to the 8xC251SA, 8xC251SB, 8xC251SP, 8xC251SQ,

8xC251Tx Hardware Descriptionvi December 2003 273138-002

18xC251Tx Hardware Description1.0 INTRODUCTION TO THE 8xC251TxThis Hardware Description describes the 8xC251TB, 8xC251TQ (referred to collectively as

8xC251Tx Hardware Description22.0 SIGNAL SUMMARYTable 1. 8xC251Tx Signal SummaryAddress & Data Input/OutputName PLCC DIP Name PLCC DIPAD0/P0.0 43

38xC251Tx Hardware DescriptionTable 2. 8xC251Tx Signal Descriptions (Sheet 1 of 3)Signal NameType DescriptionAlternate FunctionA17 O Address Line 17.