???????(??) RTC ????

1
???????(??)RTC ????

• ???? ???
• ???? ???
• ???
• ???

2
RTC ??

• RTC Real Time Clock
• ?? - ???IC?????????
• ?? - ??????????
• ?? ??????

3
S3C2440 ? RTC

• ?? ??????
• ????
• ????
• ??????(ms??)

4
S3C2440 ? RTC

•  

5
S3C2440 ? RTC ???
6
BCD ??

• BCD Binary Coded Decimal

??? 8421-BCD? ?3-BCD? 2421-A?
(M10) D C B A C3 C2 C1 C0 a3 a2 a1 a0
0 0 0 0 0 0 0 1 1 0 0 0 0
1 0 0 0 1 0 1 0 0 0 0 0 1
2 0 0 1 0 0 1 0 1 0 0 1 0
3 0 0 1 1 0 1 1 0 0 0 1 1
4 0 1 0 0 0 1 1 1 0 1 0 0
5 0 1 0 1 1 0 0 0 0 1 0 1
6 0 1 1 0 1 0 0 1 0 1 1 0
7 0 1 1 1 1 0 1 0 0 1 1 1
8 1 0 0 0 1 0 1 1 1 1 1 0
9 1 0 0 1 1 1 0 0 1 1 1 1
7
S3C2440 RTC ?????

• ?? ??????????
• ???????
• ?? 8??????2?BCD??
• ?????00?????

8
S3C2440 RTC ???

• ?? ??????
• ??RTCON???
• ?? ???????????

9
S3C2440 RTC ????

•  

10
S3C2440 RTC ???????

• ?? ????RTC?????
• ????????????????
• ?? ??????????????

11
S3C2440 RTC ???(RTCON)
??? ?? R/W ?? ???
RTCCON 0x57000040(L) R/W RTC ????? 0x0
RTCCON 0x57000043(B) (by byte) RTC ????? 0x0
12
S3C2440 RTC ???(RTCON)

• ?? rRTCCON 1 //?? RTC??
• rRTCCON 1 //?? RTC??

RTCCON ?? ?? ????
CLKRST 3 RTC ?????? 0
CLKRST 3 0???,1?? 0
CNTSEL 2 BCD???? 0
CNTSEL 2 0?? BCD ??,1?? 0
CLKSEL 1 BCD ???? 0
CLKSEL 1 0XTAL (1/2)15????,1?? 0
RTCENT 0 ??RTC?? 0
RTCENT 0 0??,1?? 0
13
S3C2440 RTC ???(TICNT)
??? ?? R/W ?? ???
TICNT 0x57000044(L) R/W ????????? 0x0
0x57000047(B) (by byte)
TICNT ?? ?? ????
TICK INT ENABLE 7 ???????? 0
TICK INT ENABLE 7 0??,1?? 0
TICK TIME COUNTER 60 ???????(1127) 000000
60 ???????,?????????????? 000000
14
S3C2440 RTC ???(BCDXX)

• ?? rDCDSEC 0x15 //?RTC?????15
• sec rDCDSEC //?RTC?????sec

??? ?? R/W ??
BCDSEC 0x57000070 R/W ??RTC?????
BCDMIN 0x57000074 R/W ??RTC?????
BCDHOUR 0x57000078 R/W ??RTC?????
BCDDAY 0x5700007C R/W ??RTC?????
BCDDATA 0x57000080 R/W ??RTC?????
BCDMON 0x57000084 R/W ??RTC?????
BCDYEAR 0x57000088 R/W ??RTC?????
15
???(DNW)??

• ??? S3C2440 ? GPIO
• Port_Init()
• ????? num
• Uart_Init(num)
• ???????
• Port_Init(0,speed)
• ??????????(?printf)
• Uart_Printf(d,f,x,int1,float,int2)

16
??

• ?? S3C2440 RTC
• ? S3C2440 RTC ?? 2010/4/20 110030
• ?? S3C2440 RTC
• ? S3C2440 RTC ??????????
• ????????
• ?????? (LED ??) ????
• ???????