I seem to be unable to activate the second async serial port on a XC161CJ. There's hardly any difference between both ports and "ASC0" runs fine. But whatever I do, "TXD1" will not transmit anything. Does anyone have any experience with programming this port? These are my settings: ASC0_FDV = 0x016f; ASC0_BG = 0x0006; ASC0_CON = 0x8811; ALTSEL0P3 |= 0x0c00; P3 = (P3 & ~(uword)0x0800) | 0x0400; DP3 = (DP3 & ~(uword)0x0800) | 0x0400; ASC1_FDV = 0x016f; ASC1_BG = 0x0006; ASC1_CON = 0x8811; ALTSEL0P3 |= 0x0003; P3 = (P3 & ~(uword)0x0002) | 0x0001; DP3 = (DP3 & ~(uword)0x0002) | 0x0001; Now, if I write a value to "ASC0_TBUF" it comes out of pin "TXD0" serially.(don't bother about interrupts) If I do the same with "ASC1_TBUF" nothing happens. I can write a value to the pin itself, so physically there's nothing wrong. What am I missing??? Frank
Hi Frank, checked the manual of XC161 (the new one), if I am not so stupid the complete SCU description is missing. (Should be chapter 8 ). So I want to recommend you the information I got from XC167CI device. System manual P8-34. XC167CI In principal there are only the disable bits inside located. The reset value depends what is disabled by default. SYSCON registers are write protected after EINIT. Stefan
Yes, that seems to be equal to the "older" XC161 manual. It still mentions a reset value of "0000H",though (all devices activated) For the XC167 there is an "rev AC" errata sheet that says: Documentation Update: • XC167 System Units – Draft User's Manual V1.1, 2002-12: - p. 8-35: the reset value for register SYSCON3 is 9FD0h, i.e. not all modules are enabled after reset Seems this one needs an update too. I guess it's best to always updata these registers anyhow....just in case... Frank
You are right, of course, there are minor differences between the devices. I did report to Infineon about the missing chapter of the SCU. If I get any information I will inform you again. Most importantly is, that you have been solved your problem. Stefan
Hi Frank, got the informations from Infineon. There in fact some informations gone lost (missing ?). Recommendation is to refer the XC167 manuals (as we did). The informations in general are valid and will take again in the manual with next update. I gave the hint to let flow in the most actual RESET values of the register with these updates. Time plan is not known as this time. Stefan