HD64F3687HV Datasheet, PDF (390/538 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Section 19 EEPROM
SCL
SDA
1 2 34 5 6 7891
8 91
891
89
A15
A8
A7
A0
D7
D0
D7
D0
Start
condition
Slave address
R/W ACK
Upper memory
address
ACK
lower memory
address
ACK
Write Data
ACK
[Legend]
R/W: R/W code (0 is for a write and 1 is for a read),
ACK: acknowledge
Figure 19.4 Page Write Operation
Write Data ACK
Stop
conditon
19.4.8 Acknowledge Polling
Acknowledge polling feature is used to show if the EEPROM is in an internally-timed write cycle
or not. This feature is initiated by the input of the 8-bit slave address + R/W code following the
start condition during an internally-timed write cycle. Acknowledge polling will operate R/W
code = "0". The ninth acknowledgement judges if the EEPROM is an internally-timed write cycle
or not. Acknowledgement "1" shows the EEPROM is in a internally-timed write cycle and
acknowledgement "0" shows the internally-timed write cycle has been completed. The
acknowledge polling starts to function after a write data is input, i.e., when the stop condition is
input.
19.4.9 Read Operation
There are three read operations; current address read, random address read, and sequential read.
Read operations are initiated in the same way as write operations with the exception of R/W = 1.
1. Current Address Read
The internal address counter maintains the (n+1) address that is made by the last address (n)
accessed during the last read or write operation, with incremented by one. Current address
read accesses the (n+1) address kept by the internal address counter.
After receiving in the order of a start condition and the slave address + R/W code (R/W = 1),
the EEPROM outputs the 1-byte data of the (n+1) address from the most significant bit
following acknowledgement "0". If the EEPROM receives in the order of acknowledgement
"1" and a following stop condition, the EEPROM stops the read operation and is turned to a
standby state.
Rev.5.00 Nov. 02, 2005 Page 356 of 500
REJ09B0027-0500