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T85C5121-ICRIL Datasheet(PDF) 2 Page - ATMEL Corporation |
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T85C5121-ICRIL Datasheet(HTML) 2 Page - ATMEL Corporation |
2 / 115 page 2 A/T8xC5121 4164G–SCR–07/06 Description T8xC5121 is a high performance CMOS ROM/CRAM derivative of the 80C51 CMOS single chip 8-bit microcontrollers. T8xC5121 retains the features of the Atmel 80C51 with extended ROM capacity (16 Kbytes), 512 bytes of internal RAM, a 4-level interrupt system, two 16-bit timer/counters (T0/T1), a full duplex enhanced UART (EUART) with baud rate generator (BRG) and an on-chip oscillator. In addition, the T8xC5121 have, a Multi protocol Smart Card Interface, a dual data pointer, 2 programmable LED current sources (2-4-10 mA) and a hardware Watchdog. T89C5121 Flash RAM version and T85C5121 Code RAM version can be loaded by In- System Programming (ISP) software residing in the on-chip ROM from a low-cost exter- nal serial EEPROM or from R232 interface. T8xC5121 have 2 software-selectable modes of reduced activity for further reduction in power consumption. Block Diagram Figure 1. Block Diagram Notes: 1. Alternate function of Port 1 2. Alternate function of Port 3 3. Only for the Code RAM version 4. Only for PLCC52 Timer 0 INT RAM 256 x8 XTAL2 XTAL1 EUART CPU Timer 1 Ctrl C51 CORE (2)(2) (2)(2) IB-bus (1): ROM Xtal Osc XRAM 256 x8 SCIB CC8 CRST CPRES CIO CC4 CCLK C V CC 6 I/Os CRST1 CIO1 CCLK1 (2) (2) (2) (4) 16K x8 CRAM 16K x8 (2) (2) 8 I/Os Voltage Reg. (1) (1) (1) (1) (1) (1) LED Drive Direct (2) (2) Output :1-16 Clock (3) Prescaler X2 Watchdog EA PSEN ALE DC/DC Converter Level Shifters POR PFD Alternate Card BRG Parallel I/O Ports |
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