SX52BD - 3V 40MHz

Hello, Alexander! You wrote to All on Tue, 21 Jun 2005 12:51:07 +0400:

AL> çÏÓÐÏÄÁ, ËÁË ÚÁÓÔÁ×ÉÔØ ÎÏÒÍÁÌØÎÏ ÒÁÂÏÔÁÔØ SX ÎÁ 3V ÐÒÉ 40í?

AL> ðÒÉ ÐÏÎÉÖÅÎÉÉ ÐÉÔÁÎÉÑ ÄÏ 4V ÎÁÞÉÎÁÀÔ ÐÒÏÉÓÈÏÄÉÔØ ×ÓÑËÉÅ ÍÅÒÚÏÓÔÉ. AL> HÁÐÒÉÍÅÒ ÎÏÇÁ ÐÏÒÔÁ ÍÏÖÅÔ ÕÓÔÁÎÏ×ÉÔØÓÑ × 0, Á ÍÏÖÅÔ É ÎÅÔ. AL> õ ÍÅÎÑ ÐÏÄÏÚÒÅÎÉÑ ÎÁ ÏÓÃÉÌÑÔÏÒ. ÷ ËÒÉ×ÏÍ ÄÁÔÁÛÉÔÅ ÎÉÞÅÇÏ ÎÅÔ ÏÂ

WBR, AVB

Hello, Alexey!

AV> á Ë×ÁÒà ÆÕÎÄÁÍÅÔÎÁÌØÎÙÊ? ðÒÏÂÏ×ÁÌ ÄÁÖÅ ÏÔ ×ÎÅÛÎÅÇÏ ÇÅÎÅÒÁÔÏÒÁ, ÒÅÚÕÌØÔÁÔ ÔÏÔ-ÖÅ.

AV> ðÉÔÁÎÉÅ ÈÏÒÏÛÏ ÒÁÚ×ÅÄÅÎÏ? HÅ ÉÄÅÁÌØÎÏ ËÏÎÅÞÎÏ, ÎÏ ×ÐÏÌÎÅ ÐÒÉÌÉÞÎÏ.

AV> âÌÏËÉÒÏ×ÏÞÎÙÅ ÅÍËÏÓÔÉ ÄÏÓÔÁÔÏÞÎÏ ×ÙÓÏËÏÞÁÔÏÔÎÙÅ ÓÔÏÑÔ? ëÅÒÁÍÉËÁ, ÐÏ 0.1.

AV> õ ÍÅÎÑ ÎÉËÁËÉÈ ÐÒÅÔÅÎÚÉÊ Ë ÜÔÏÍÕ ÄÅ×ÁÊÓÕ ÎÅÔ. òÁÂÏÔÁÅÔ × ÐÏÌÎÏÍ AV> ÓÏÏÔ×ÅÔÓÔ×ÉÉ Ó ÄÏËÕÍÅÎÔÁÃÉÅÊ. ÷ ÏÂÝÅÍ Ñ ÐÒÏÂÌÅÍÕ ÒÅÛÉÌ, ÈÏÔÑ É ÞÅÒÅÚ ö. PortA Õ ÍÅÎÑ ÉÓÐÏÌØÚÕÅÔÓÑ ÄÌÑ ÕÐÒÁ×ÌÅÎÉÑ ÓÔÁÔÉËÏÊ AS7C... ðÒÉ ×ÙÐÏÌÎÅÎÉÉ ÐÏÓÌÅÄÏ×ÁÔÅÌØÎÏÓÔÉ ËÏÍÁÎÄ bcf CS_RAM ; CS sram --> 0 bcf READ ; Read --> 0 ×ÔÏÒÁÑ ËÏÍÁÎÄÁ ÎÅ ×ÓÅÇÄÁ ×ÙÐÏÌÎÑÅÔÓÑ × ÄÉÁÐÁÚÏÎÅ 3.0-4V é, ÞÔÏ ÓÁÍÏÅ ÉÎÔÅÒÅÓÎÏÅ, × ÄÉÁÐÁÚÏÎÅ 2.2-3V ÒÁÂÏÔÏÓÐÏÓÏÂÎÏÓÔØ ×ÏÓÓÔÁÎÁ×ÌÉ×ÁÅÔÓÑ. ëÏÍÁÎÄÙ movlw 0xFF^((1<<p_RAM)|(1<<p_RD)) andwf PortA,F ÄÁÀÔ ÔÅ ÖÅ ÒÅÚÕÌØÔÁÔÙ. òÁÚÎÅÓ ÓÉÇÎÁÌÙ ÎÁ ÒÁÚÎÙÅ ÐÏÒÔÙ, ×ÓÅ ÚÁÒÁÂÏÔÁÌÏ. ðÒÏ×ÅÒÅÎÏ ÐÏËÁ ÎÁ Ä×ÕÈ ËÒÉÓÔÁÌÌÁÈ ÉÚ ÒÁÚÎÙÈ ÐÁÒÔÉÊ. õ ÍÅÎÑ ÒÁÚÕÍÎÙÈ ÏÂßÑÓÎÅÎÉÊ ÜÔÏÍÕ ÎÅÔ.

With best regards, . E-mail: snipped-for-privacy@p80.f.n6023.z2.fidonet.org

Hello, Alexander! You wrote to Alexey V Bugrov on Fri, 24 Jun 2005 09:54:33 +0400:

AV>> âÌÏËÉÒÏ×ÏÞÎÙÅ ÅÍËÏÓÔÉ ÄÏÓÔÁÔÏÞÎÏ ×ÙÓÏËÏÞÁÔÏÔÎÙÅ ÓÔÏÑÔ? AL> ëÅÒÁÍÉËÁ, ÐÏ 0.1.

AV>> õ ÍÅÎÑ ÎÉËÁËÉÈ ÐÒÅÔÅÎÚÉÊ Ë ÜÔÏÍÕ ÄÅ×ÁÊÓÕ ÎÅÔ. òÁÂÏÔÁÅÔ × ÐÏÌÎÏÍ AV>> ÓÏÏÔ×ÅÔÓÔ×ÉÉ Ó ÄÏËÕÍÅÎÔÁÃÉÅÊ. AL> ÷ ÏÂÝÅÍ Ñ ÐÒÏÂÌÅÍÕ ÒÅÛÉÌ, ÈÏÔÑ É ÞÅÒÅÚ ö. AL> PortA Õ ÍÅÎÑ ÉÓÐÏÌØÚÕÅÔÓÑ ÄÌÑ ÕÐÒÁ×ÌÅÎÉÑ ÓÔÁÔÉËÏÊ AS7C... ðÒÉ AL> ×ÙÐÏÌÎÅÎÉÉ ÐÏÓÌÅÄÏ×ÁÔÅÌØÎÏÓÔÉ ËÏÍÁÎÄ AL> bcf CS_RAM ; CS sram --> 0 AL> bcf READ ; Read --> 0 ×ÔÏÒÁÑ ËÏÍÁÎÄÁ ÎÅ ×ÓÅÇÄÁ AL> ×ÙÐÏÌÎÑÅÔÓÑ × ÄÉÁÐÁÚÏÎÅ 3.0-4V

When two successive instructions are used on the same I/O port (except "mov Rx,W" ) with a very high clock rate, the "write" part of one instruction might not occur soon enough before the "read" part of the very next instruction, resulting in getting "old" data for the second instruction. To ensure predictable results, avoid using two succes- sive read-modify-write instructions that access the same port data register if the clock rate is high or, insert 3 NOP instructions between the successive read-modify-write instructions (if SYNC bit in the FUSE register is enabled,

WBR, AVB

Epcos B37940-K5010-C01 1000 Ðæ NP0 ÒÁÚÍÅÒ 0805

Epcos B37941-K9224-K62 0.22 ÍËæ X7R ÒÁÚÍÅÒ 0805

Hello, Andrei! You wrote to Alexey V Bugrov on Fri, 24 Jun 2005 08:51:16 +0000 (UTC):

AM> úÁ×ÉÓÉÍÏÓÔØ ÍÏÄÕÌÑ ÐÏÌÎÏÇÏ ÓÏÐÒÏÔÉ×ÌÅÎÉÑ ÏÔ ÞÁÓÔÏÔÙ ÄÌÑ ÒÁÚÎÙÈ AM> ËÏÎÄÅÎÓÁÔÏÒÏ×: AM> Epcos B37940-K5010-C01 1000 Ðæ NP0 ÒÁÚÍÅÒ 0805 10 íçà - 15 ïÍ 50 íçà AM> - 3 OÍ 100 íçà - 1 ïÍ 150 íçà - 0.2 ïÍ 200 íçà - 1 ïÍ 300 íçà - 3 AM> ïÍ AM> Epcos B37941-K9224-K62 0.22 ÍËæ X7R ÒÁÚÍÅÒ 0805 10 íçà - 0.03 OÍ 50 AM> íçà - 0.7 ïÍ 100 íçà - 1 ïÍ 150 íçà - 1.5 ïÍ 200 íçà - 2 ïÍ 300 íçà AM> - 3 ïÍ

AM> é ÄÌÑ ÞÅÇÏ ÓÔÁ×ÉÔØ ÎÁ 50 íçà ÍÉËÒÏÐÒÏÃÅÓÓÏÒ ËÏÎÄÅÎÓÁÔÏÒÙ NP0, ÅÓÌÉ AM> ÎÅ ÕÞÉÔÙ×ÁÔØ ÅÇÏ ÕÚËÉÊ ÐÏÓÌÅÄÏ×ÁÔÅÌØÎÙÊ ÒÅÚÏÎÁÎÓ ÎÁ 150?

AM> ÷ÏÔ 1 ÍËæ Y5U ÕÖÅ ÐÏÈÕÖÅ, Õ ÎÅÇÏ ÎÁ 100 íçà ÐÏÞÔÉ Ä×Á ÏÍÁ É ÄÁÌØÛÅ AM> ÒÁÓÔÅÔ.

WBR, AVB

Hello, Alexey!

AV> HÕ ÅÝÅ ÏÂÒÁÔÉ ×ÎÉÍÁÎÉÅ ÎÁ ÜÔÏ:

AV> When two successive instructions are used on the same AV> I/O port (except "mov Rx,W" ) with a very high clock rate, AV> the "write" part of one instruction might not occur soon AV> enough before the "read" part of the very next instruction, AV> resulting in getting "old" data for the second instruction. AV> To ensure predictable results, avoid using two succes- AV> sive read-modify-write instructions that access the same AV> port data register if the clock rate is high or, insert 3 NOP AV> instructions between the successive read-modify-write AV> instructions (if SYNC bit in the FUSE register is enabled, AV> 5 NOP instructions are required). For operating frequen- AV> cies of 50 MHz or lower, if bit 7 of the T2CNTB (POR- AV> TRD) is set, the port reads data from the data register AV> instead of port pins. In this case, the NOP instructions AV> are not required.

With best regards, . E-mail:

Hello, Andrei! You wrote to Alexey V Bugrov on Fri, 24 Jun 2005 09:42:27 +0000 (UTC):

AM>>> é ÄÌÑ ÞÅÇÏ ÓÔÁ×ÉÔØ ÎÁ 50 íçà ÍÉËÒÏÐÒÏÃÅÓÓÏÒ ËÏÎÄÅÎÓÁÔÏÒÙ NP0, ÅÓÌÉ AM>>> ÎÅ ÕÞÉÔÙ×ÁÔØ ÅÇÏ ÕÚËÉÊ ÐÏÓÌÅÄÏ×ÁÔÅÌØÎÙÊ ÒÅÚÏÎÁÎÓ ÎÁ 150?

AM> ñ ÄÌÑ ÞÅÇÏ É ÎÁÐÉÓÁÌ, ÞÔÏ ÎÁ 300 íçà ÞÔÏ 1000 Ðæ NP0, ÞÔÏ 0.22 ÍËæ AM> X7R - ÂÅÚ ÒÁÚÎÉÃÙ, É ÔÏÔ É ÄÒÕÇÏÊ ÔÒÉ ÏÍÁ.

AM> ôÏ ÅÓÔØ ÒÅÁÌØÎÏ 1 Îæ NP0 ÎÕÖÎÁ × ÁÎÁÌÏÇÏ×ÙÈ ÓÈÅÍÁÈ ×ÒÏÄÅ áãð ÎÁ ÓÏÔÎÉ AM> ÍÅÇÁÓÁÍÐÌÏ×, ËÏÇÄÁ ÈÏÞÅÔÓÑ ÎÅ ÐÒÏÓÔÏ ÎÅÂÏÌØÛÏÇÏ Z ÎÁ ÓÏÔÎÑÈ ÍÅÇÁÇÅÒÃ, Á AM> ÉÍÅÎÎÏ ËÁË ÍÏÖÎÏ ÂÏÌÅÅ ÎÉÚËÏÇÏ. á ÄÌÑ ÔÁËÏÇÏ ÍÉËÒÏÐÒÏÃÅÓÓÏÒÁ ÜÔÏ ×ÓÅ AM> ÒÁ×ÎÏ.

WBR, AVB

Hello, Andrei! You wrote to Alexey V Bugrov on Fri, 24 Jun 2005 10:30:07 +0000 (UTC):

AM> ðÌÏÝÁÄØ É ÔÒÁÓÓÉÒÏ×ÏÞÎÁÑ ÓÐÏÓÏÂÎÏÓÔØ ÐÌÁÔÙ. ïÔ ÄÅÛÅ×ÏÊ ÞÅÔÙÒÅÈÓÌÏÊËÉ AM> Ó ÂÏÌØÛÉÍ ÄÉÁÍÅÔÒÏÍ vias ËÏÎÄÅÎÓÁÔÏÒÙ ÏÔÖÉÒÁÀÔ ÄÏ×ÏÌØÎÏ ÍÎÏÇÏ AM> ÔÒÁÓÓÉÒÏ×ÏÞÎÏÊ ÓÐÏÓÏÂÎÏÓÔÉ.

AM> á × ÞÅÍ ×ÙÒÁÖÁÅÔÓÑ ÐÒÁËÔÉËÁ?

WBR, AVB