SEMICONDUCTOR DEVICE

• Main Authors: OTA KIYOTO, FUJIMOTO TOMONORI
• Format: Patent
• Language: English
• Published: 08.10.1999
• Edition: 6
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; INFORMATION STORAGE; PHYSICS; STATIC STORES

PROBLEM TO BE SOLVED: To easily changeover the refresh period during a refresh time of memory which requires refresh from the external side by providing a logic circuit to supply a period setting signal for designating one of a plurality of refresh periods and a clock to the memory. SOLUTION: CPU1 supplies, depending on an external low power mode instruction LPM, a clock CP, an auto-refresh period setting signal RAUTO, a self-refresh control signal RSELF and a refresh period setting signal SLFPS to control DRAM core 2. Namely, CPU1 changes over the refresh period by the refresh period setting signal SLFPS during the self-refresh of DRAM core 2 to set the DRAM core 2 to the self-refresh mode and elongates the refresh period of the DRAM core 2 in the timing wherein internal temperature of the semiconductor device is sufficiently lowered.