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BR93H86RFVM-2C Datasheet(PDF) 13 Page - Rohm

Part No. BR93H86RFVM-2C
Description  Serial EEPROM Series Automotive EEPROM 125℃ Operation Microwire BUS EEPROM (3-wire)
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Maker  ROHM [Rohm]
Homepage  http://www.rohm.com
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BR93H86RFVM-2C Datasheet(HTML) 13 Page - Rohm

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BR93H86-2C
13/29
Datasheet
Datasheet
www.rohm.com
19.DEC.2012 Rev.002
TSZ02201-0R1R0G100050-1-2
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
Description of Operation
Communications of the Microwire Bus are carried out by SK (serial clock), DI (serial data input),DO (serial data output) ,and
CS (chip select) for device selection.
In connecting one EEPROM to a microcontroller, connect it as shown in Figure 29-(a) or Figure 29-(b). And, when using the
input and output common I/O port of the microcontroller, connect DI and DO via a resistor as shown in Figure 29-(b) (Refer to
pages 19-20), wherein connection by 3 lines is possible.
In case of using multiple EEPROM devices, refer to Figure 29-(c).
Communications of the Microwire Bus are started by the first “1” input after the rise of CS. This input is called the “Start Bit”.
After input of the start bit, the “Ope Code”, Address, and Data are then inputted consecutively. Address and Data are all
inputted with MSB first.
All “0” signal inputs after the rise of CS up to the start bit is ignored. Therefore, if there is a limitation in the bit width of PIC of
the microcontroller, it is possible to input “0” before the start bit to control the bit width.
Command Mode
Command
Start
bit
Ope
code
Address
Data
BR93H86-2C
Read (READ)
(1)
1
10
A9,A8,A7,A6,A5,A4,A3,A2,A1,A0
D15 to D0(READ DATA)
Write enable (WEN)
1
00
1
1
* * * * * * * *
-
Write (WRITE)
(2)
1
01
A9,A8,A7,A6,A5,A4,A3,A2,A1,A0
D15 to D0(WRITE DATA)
Write all (WRAL)
(2,3)
1
00
0
1
* * * * *B2,B1,B0
D15 to D0(WRITE DATA)
Write disable (WDS)
1
00
0
0
* * * * * * * *
-
・ Input the address and the data in MSB-first order.
・ As for *, input either VIH or VIL.
*Start bit
Acceptance of all the commands of this IC starts at recognition of the start bit.
The “Start Bit” means the first “1” input after the rise of CS.
(1)
For READ, after setting the command, the data output of the selected address starts.
Then, in a sequential order of addresses,
the data of the next address will be outputted , and will continuously output data of succeeding addresses with the use of a continuous SK clock input.
(Auto-Increment Function)
(2)
When the WRITE and the WRITE-All commands are executed, the previous data written in the selected memory cell are automatically deleted first, then the
input data is written next.
(3)
For the write all command, data written in memory cell of the areas designated by B2, B1, and B0 are automatically deleted, and input data is written in bulk.
Write All Area
Figure 29 Connection Methods with Microcontroller
Figure 29-(a). Connection by 4 lines
CS
SK
DO
DI
CS
SK
DO
CS
SK
DI
DO
Figure 29-(b). Connection by 3 lines
CS
SK
DI
DO
CS3
CS1
CS0
SK
DO
DI
Figure 29-(c). Connection example of multiple devices
Micro-
controller
BR93H86
Micro-
controller
BR93H86
Micro-
controller
B2 B1 B0
Write area
0
0
0
000h to 07Fh
0
0
1
080h to 0FFh
0
1
0
100h to 17Fh
0
1
1
180h to 1FFh
1
0
0
200h to 27Fh
1
0
1
280h to 2FFh
1
1
0
300h to 37Fh
1
1
1
380h to 3FFh
Device 1
Device 2
Device 3
・The write all command is written in bulk in 2Kbit unit.
The write area can be selected up to 3bit. Confirm on
the left side the settings and write areas of B2, B1, and B0.


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