Eeprom Circuit - Toshiba MR-3011 Service Manual

10.10 EEPROM Circuit

SGND
This circuit is an EEPROM to store ADF data and its peripheral circuit.
IC12 is a memory to store the adjustment value for reflection-type sensors, and data are sent/received between
IC12 and CPU using a 4-line type serial interface. Data saved in the IC12 is not erased even if the power is
turned OFF.
IC12-1pin (CS) is a chip selection terminal and its level is "H" when data are being sent/received.
IC12-2pin (CLK) is a serial clock terminal, and the serial data are sent in synchronization with the clock input
which is input to this terminal.
IC12-3pin (DI) is a input terminal for serial data and 4pin (DO) is an output terminal for serial data.
October 2000 © TOSHIBA TEC
IC12
R108
4
DO
1
CS
6 2
NC1 CLK
7 3
NC2 DI
+5V
1
2
RA1.1
1
RA1.4
8
6 RA1.3
10-8 MR-3011/3012 DESCRIPTION OF CIRCUITS
CS
CLK
DI
D0
2
7
5
SGND