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8XC251TA Datasheet(PDF) 5 Page - Intel Corporation |
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8XC251TA Datasheet(HTML) 5 Page - Intel Corporation |
5 / 18 page 1 8xC251Tx Hardware Description 1.0 INTRODUCTION TO THE 8xC251Tx This Hardware Description describes the 8xC251TA, 8xC251TB, 8xC251TP, 8xC251TQ (referred to collec- tively as the 8xC251Tx) embedded microcontroller, which is the newest member of the MCS ® 251 microcon- troller family. The 8xC251Tx is pin and code compatible with the 8xC251Sx but is enhanced with the addition of new features. This document addresses the differences between the two members of the MCS 251 microcontroller family. For a detailed description of the MCS 251 microcontroller core and standard peripherals shared by both the 8xC251Sx and 8xC251Tx, please refer to the 8xC251SA, 8xC251SB, 8xC251SP, 8xC251SQ Embedded Microcontroller User’s Manual (272795). 1.1 Comparing the 8xC251Tx and 8xC251Sx The differences between the 8xC251Tx and the 8xC251Sx are briefly described here. • The maximum operating frequency of the 8xC251Tx is 24 Mhz compared to 16 MHz for the 8xC251Sx. • The 8xC251Tx has two serial I/O ports while the 8xC251Sx has one. The pins for the second serial I/O port are multiplexed with other functional pins. • The 8xC251Tx has a new configuration option (Extended Data Float timing) to allow interfacing with slower memories. This feature is supported by a bit in the configuration byte, UCONFIG1. The corre- sponding bit in the 8xC251Sx has a different function. • The 8xC251Tx is offered in with factory programmed ROM while the 8xC251Sx is also offered with OTPROM/EPROM. Figure 1. 8xC251Tx Block Diagram PORT 0-3 EPROM/ ROM RAM BUS INTERFACE UNIT Instruction Sequencer ALU Register File Program Counter Clock and Reset Unit Interrupt Handler Unit Peripherals 3 Timers WDT PCA Serial I/O 824 8 16 INSTR 24 PC 16 16 Memory Data Memory Address CPU SRC1, SRC2 DST RESET P0 (A7- 0/D7-0) P2 (A15-8) P3 PSEN ALE VCC VSS P1 XTAL1 XTAL2 2nd Serial I/O |
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