r8a66120ffa Renesas Electronics Corporation., r8a66120ffa Datasheet - Page 5

• Manufacturer Part Number: r8a66120ffa
• Description: 4m-bit X 2 Multiple Field Memory
• Manufacturer: Renesas Electronics Corporation.

Power On
After power-on this IC, some circuits of internal FIFO should be initialized by the following procedures (1), (2).
Also, when the supply voltage (Vcc) drops below the operation voltage range(3.0 to 3.6V) during operating and so this is powered
on again, they should be initialized by the same procedures.
(1)After 1msec or more has passed under the following conditions (i), (ii) and (iii), please input the signal of “L” to “H” to POR pin
(2)After POR pin is fixed at “H”, write reset and read reset operations should be provided with 100 cycles or more respectively.
REJ03F0161-0170 Rev.1.70 May.16.2008
R8A66120FFA
page 5 of 14
Pin nam e
There is no problem in these reset operations, if total reset cycles reach to 100 or more even if those are discontinuous.
for power on reset. After of that, POR pin should be fixed at "H".
WRES
RRES
POR
Vcc
CK
3.0V ～ 3.6V
(i) :Vcc reaches to the operation voltage range.
(ii) :The clock signal is inputted to CK pin
(iii) :POR pin is fixed at "L".
GND
GND
GND
1msec or more
GND
100 cycles or more of continuous or
discontinuous reset operation
Vcc
Vcc
Vcc
Vcc