HD6433682 ETC, HD6433682 Datasheet - Page 361

• Manufacturer Part Number: HD6433682
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
• Manufacturer: ETC

19.2
Pins used in the EEPROM are listed in table 19.1.
Table 19.1 Pin Configuration
19.3
The EEPROM has a following register.
19.3.1
EKR is an 8-bit readable/writable register, which changes the slave address code written in the
EEPROM. The slave address code is changed by writing H'5F in EKR and then writing either of
H'00 to H'07 as an address code to the H'FF09 address in the EEPROM by the byte write method.
EKR is initialized to H'FF.
Pin name
Serial clock pin
Serial data pin
EEPROM key register (EKR)
Input/Output Pins
Register Description
EEPROM Key Register (EKR)
Symbol
SCL
SDA
Input/Output Function
Input
Input/Output
The SCL pin is used to control serial input/output data
timing. The data is input at the rising edge of the
clock and output at the falling edge of the clock. The
SCL pin needs to be pulled up by resistor as that pin
is open-drain driven structure of the I
proper resistor value for your system by considering
V
DC Characteristics and in section 23.2.3, AC
Characteristics. Maximum clock frequency is 400
kHz.
The SDA pin is bidirectional for serial data transfer.
The SDA pin needs to be pulled up by resistor as that
pin is open-drain driven structure. Use proper resistor
value for your system by considering V
C
Characteristics and in section 23.2.3, AC
Characteristics. Except for a start condition and a
stop condition which will be discussed later, the high-
to-low and low-to-high change of SDA input should be
done during SCL low periods.
OL
IN
, I
pin capacitance in section 23.2.2, DC
OL
, and the C
IN
Rev. 3.00, 05/03, page 331 of 472
pin capacitance in section 23.2.2,
2
C pin. Use
OL
, I
OL
, and the