Motore di ricerca datesheet componenti elettronici |
|
SM89516 Scheda tecnica(PDF) 7 Page - SyncMOS Technologies,Inc |
|
SM89516 Scheda tecnica(HTML) 7 Page - SyncMOS Technologies,Inc |
7 / 19 page SyncMOS Technologies International, Inc. SM89516 8-Bits Micro-controller With 64KB flash & 1KB RAM embedded Specifications subject to change without notice contact your sales representatives for the most recent information. Ver 2.1 SM89516 08/2006 7 Internal RAM Control Register (RCON, $85) bit-7 bit-0 Unused Unused Unused Unused Unused Unused RAMS1 RAMS0 Read / Write: - - - - - - R/W R/W Reset value: * * * * * * 0 0 SM89516A has 768 byte on-chip RAM which can be accessed by external memory addressing method only. (By instruction MOVX). The address space of instruction MOVX @Rn is determined by bit 1 and bit 0 (RAMS1, RAMS0) of RCON. The default setting of RAMS1, RAMS0 bits is 00 (page0). RAMS1 RAMS0 MOVX @Ri i=0,1 mapping to expended RAM address 0 0 $0000 ~ $00FF 0 1 $0100 ~ $01FF 1 0 $0200 ~ $02FF The port 0, port2, port3.6 and port3.7 can be used as general purpose I/O pin while port0 is open-drain structure. System Control Register (SCONF, $BF) bit-7 bit-0 WDR Unused Unused Unused Unused Unused OME ALEI Read / Write: R/W - - - - - R/W R/W Reset value: 0 * * * * * 1 0 WDR: Watch Dog Timer Reset. When system reset by Watch Dog Timer overflow, WDR will be set to 1 OME: 768 bytes on-chip RAM enable bit ALEI: ALE output inhibit bit, to reduce EMI The bit 7(WDR) of SCONF is Watch Dog Timer Reset bit. It will be set to 1 when reset signal generated by WDT overflow. User should check WDR bit whenever un-predicted reset happened. 1.3 I/O Pin Configuration The ports 1, 2 and 3 of standard 8051 have internal pull-up resistor, and port 0 has open-drain outputs. Each I/O pin can be used independently as an input or an output. For I/O ports to be used as an input pin, the port bit latch must contain a ‘1’ which turns off the output driver FET. Then for port 1, 2 and 3 port pin is pulled high by a weak internal pull-up, and can be pulled low by an external source. The port 0 has open-drain outputs which means its pull-ups are not active during normal port operation. Writing ‘1’ to the port 0 bit latch will causing bit floating so that it can be used as a high-impedance input. The port 4 used as GPIO will has the same function as port 1, 2 and 3. |
Codice articolo simile - SM89516 |
|
Descrizione simile - SM89516 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEETIT.COM |
Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |