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28-Pin Demo Board I 2 C? Demonstration Firmware
FIGURE B-2:
I 2 C? WRITE BYTE(S)
S
SLAVE-ADR
A
DATA
A
DATA
A
DATA
A
P
[W]
WORD-ADR
Read Byte(s) with Word Address – The word address is set to begin at a given value
and incremented sequentially during the transaction.
FIGURE B-3:
I 2 C? READ BYTE(S) WITH WORD ADDRESS
S
SLAVE-ADR
A
DATA
A
RS
SLAVE- ADR
A
DATA
A
DATA N
P
[W]
WORD-ADR
[R]
Read Byte(s) without Word Address – The word address will continue in sequence from
the previous transaction to the I 2 C slave. On Reset the device address for all three
slave devices are reset to zero.
FIGURE B-4:
I 2 C? READ BYTE(S) WITHOUT WORD ADDRESS
S
SLAVE-ADR
A
DATA
A
DATA
N
P
[R]
B.6
SLAVE DEVICES
The 28-Pin Demo Board I 2 C? Demonstration firmware responds to three I 2 C slave
devices: RTC, Serial EEPROM, and Executive.
B.6.1
Slave Address: 0xA2 – Real-Time Clock Emulation
The 28-Pin Demo Board I 2 C? Demonstration emulates an I 2 C Real-Time Clock
(RTC). Table B-3 list the word addresses.
TABLE B-3:
REAL-TIME CLOCK (RTC) WORD ADDRESSES
REG
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
? 2007 Microchip Technology Inc.
NAME
RTC_CONFIG_1
RTC_CONFIG_2
RTC_SECONDS
RTC_MINUTES
RTC_HOURS
RTC_WEEKDAY
RTC_DAYS
RTC_MONTHS
DESCRIPTION
7: 0
6: 0
5: STOP – stop time function (0: RUN, 1: STOP)
4: 0
3: 0
2: 0
1: 0
0: 0
7: 0
6: 0
5: 0
4: 0
3: AF – Alarm flag
2: 0
1: AE – Alarm enable
0: 0
00-59 seconds, coding: BCD, bit 7: VL?
00-59 minutes, coding: BCD
00-23 hours, coding: BCD
00-06 weekday
01-31 day of the month
01-12 month of the year, coding: BCD
DS51647A-page 109
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