Intel 8051 manual Architectural Overview

CHAPTER 2 ARCHITECTURAL OVERVIEW AND

	FUNCTIONAL DESCRIPTION (Continued)
2.10	Accessing External Memory				25
	2.10.1 Operation of Ports				26
	2.10.2	Bus Cycle Timing			26
2.11	TimerlCounter		..........................		28
	2.11.1	TIC Mode Selection			28
	2.11.2	Configuring the TIC Input			28
	2.11.3	TIC Operation			29
	2.11.4 Reading and Reloading the TIC .... 29
2.12	Serial Channel		..........................		29
	2.12.1 Serial Port Control Register and
		Serial Data Registers		'....	31
	2.12.2	Operating Modes			31
		2.12.2.1	Operating Mode O•....•••.		31
		2.12.2.2	Operating Modes 1
			through 3		32
	2.12.3 The Serial Frame				32
	2.12.4 Transmission Rate Generation ..... 32
	2.12.5 UART Message Error Conditions ... 33
2.13	External Interface				33
	2.13.1	Processor Reset and
		Initialization			33
	2.13.2 Power Down Operation of
		Internal RAM			33
2.14	EPROM Programming				34
2.15	The 8051 as an Evolution of the 8048				34

2.16Development System and Software

	Support	34
2.17	8051 Pin Description	35
Table 2.1	Instruction Set Summary	37

AFN-01488A-04