Morrison & Foerster
Semiconductor memory
 A semiconductor memory is provided to which external data can be written during a self-refresh. Data thus written can be read out and examined to measure the oscillation frequency of the internal refresh oscillator There is no need to use special equipment such as a frequency counter for testing the oscillation frequency, and the oscillation frequency can be tested after chip sealing. 
Sharp Kabushiki Kaisha
G
G11C
inventional
Masaru
Nawaki