[ASAHI KASEI]
[AK7740ET]
7-1-b) Program RAM writes (during reset phase)
Write to the Program RAM during the reset phase with data consisting of a set of seven bytes. When all data has been
transferred, the RDY terminal is set "L". Upon completion of the PRAM write, RDY returns “H” to allow the next
data bit input. When writing data of continuous addresses, input the data as they are (no command code or address is
required). To write discontinuous data, shift the RQ terminal from "H" to "L" again. Then input the command code,
address and data in that order.
Data transfer procedure
c Command code C0h ( 1 1 0 0 0 0 0 0)
d Address upper
e Address lower
f Data
( 0 0 0 0 0 0 0 A8)
(A7 . . . . . . . A0)
(D31 . . . . . . D24)
(D23 . . . . . . D16)
(D15 . . . . . . D8)
(D7 . . . . . . D0)
g Data
h Data
i Data
S_RESET
RQ
SCLK
0000000
A7 ****A1A0
11000000
SI
D31***** D0 D31***** D0
RDY
SO
Input of continuous address data into PRAM
S_RESET
RQ
SCLK
11000000 0000000A8 A7**A1A0
11000000 0000000A8 A7**A1A0 D31***D0
SI
RDY
SO
Input of discontinuous address data into PRAM
<Pre-E-01>
- 31 -
2006/10
AKM [ ASAHI KASEI MICROSYSTEMS ]
