X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;ds=sidebyside;f=i2c%2Frtc_epson_8564je%2FREADME;h=a896bc5cbbcae8a0bdb45aee45774306c62a163a;hb=b636dd75fcc09b8e996a83210262d49a0a9e3cb1;hp=e87f4de1476673cd32c313be94f9a1e288bfd557;hpb=e63e73d94027ee7411e7137e985d8b32d2c917d7;p=sigrok-dumps.git diff --git a/i2c/rtc_epson_8564je/README b/i2c/rtc_epson_8564je/README index e87f4de..a896bc5 100644 --- a/i2c/rtc_epson_8564je/README +++ b/i2c/rtc_epson_8564je/README @@ -1,21 +1,21 @@ ------------------------------------------------------------------------------- -Epson 8564JE I2C RTC +Epson RTC-8564 JE/NB ------------------------------------------------------------------------------- -This an example capture of I2C traffic from/to an Epson 8564JE I2C RTC chip. +This is an example capture of I2C traffic from/to an Epson RTC-8564 JE/NB +I2C RTC chip, which has a slave address of 0x51 (or 0xa2, if the read/write +bit is included). Logic analyzer setup -------------------- -The logic analyzer used for capturing was a ChronoVu LA8 at a sample rate -of 1MHz. The logic analyzer probes were connected to the RTC chip like this: +The logic analyzer used was a ChronoVu LA8 (at 1MHz): Probe RTC chip pin ------------------------ 0 (green) SCL - 6 (blue) SDA - GND GND + 1 (orange) SDA Data @@ -27,8 +27,20 @@ The device talking to the RTC was doing the following in an infinite loop: - Read back the current time from the RTC. +This is what the decoded data should look like: + + - Setting the date/time: + S Wr:0xa2 A 0x02 A 0x54 A 0x03 A 0x04 A 0x22 A 0x02 A 0x11 A 0x11 A P + + - Reading the current date/time: + S Wr:0xa2 A 0x02 A Sr Rd:0xa3 A 0x54 A 0x03 A 0x44 A 0x62 A 0x52 A + 0x51 A 0x11 N P + + - The abbreviations used above: S = Start, Wr = Write, A = ACK, P = Stop, + Sr = Repeated start, Rd = Read, N = NACK + The sigrok command line used was: sigrok-cli -d 0:samplerate=1mhz --samples 8388608 \ - -p '1=SCL,7=SDA,2-6,8' -o rtc_epson_8564je.sr + -p '1=SCL,2=SDA' -o rtc_epson_8564je.sr