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STK14C88-W45 数据表(PDF) 9 Page - List of Unclassifed Manufacturers |
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STK14C88-W45 数据表(HTML) 9 Page - List of Unclassifed Manufacturers |
9 / 13 page STK14C88 December 2002 9 Document Control # ML0014 rev 0.0 SOFTWARE NONVOLATILE RECALL A software RECALL cycle is initiated with a sequence of READ operations in a manner similar to the soft- ware STORE initiation. To initiate the RECALL cycle, the following sequence of E controlled READ opera- tions must be performed: 1. Read address 0E38 (hex) Valid READ 2. Read address 31C7 (hex) Valid READ 3. Read address 03E0 (hex) Valid READ 4. Read address 3C1F (hex) Valid READ 5. Read address 303F (hex) Valid READ 6. Read address 0C63 (hex) Initiate RECALL cycle Internally, RECALL is a two-step procedure. First, the SRAM data is cleared, and second, the nonvolatile information is transferred into the SRAM cells. After the t RECALL cycle time the SRAM will once again be ready for READ and WRITE operations. The RECALL operation in no way alters the data in the nonvolatile elements. The nonvolatile data can be recalled an unlimited number of times. AutoStore™ OPERATION The STK14C88 can be powered in one of three modes. During normal AutoStore™ operation, the STK14C88 will draw current from V CCX to charge a capacitor connected to the V CAP pin. This stored charge will be used by the chip to perform a single STORE operation. After power up, when the voltage on the V CAP pin drops below VSWITCH, the part will automatically disconnect the V CAP pin from VCCX and initiate a STORE operation. Figure 2 shows the proper connection of capacitors for automatic store operation. A charge storage capacitor having a capacity of between 68 µF and 220 µF (± 20%) rated at 6V should be provided. In system power mode (Figure 3), both V CCX and V CAP are connected to the + 5V power supply without the 68 µF capacitor. In this mode the AutoStore™ function of the STK14C88 will operate on the stored system charge as power goes down. The user must, however, guarantee that V CCX does not drop below 3.6V during the 10ms STORE cycle. If an automatic STORE on power loss is not required, then V CCX can be tied to ground and + 5V applied to V CAP (Figure 4). This is the AutoStore™ Inhibit mode, in which the AutoStore™ function is disabled. If the STK14C88 is operated in this configuration, references to V CCX should be changed to V CAP throughout this data sheet. In this mode, STORE operations may be triggered through software con- trol or the HSB pin. It is not permissable to change between these three options “on the fly”. In order to prevent unneeded STORE operations, automatic STOREs as well as those initiated by externally driving HSB low will be ignored unless at least one WRITE operation has taken place since the most recent STORE or RECALL cycle. Software- initiated STORE cycles are performed regardless of whether a WRITE operation has taken place. An optional pull-up resistor is shown connected to HSB. This can be used to signal the system that the AutoStore™ cycle is in progress. Figure 2: AutoStore™ Mode 1 16 32 31 17 30 + 10k Ω∗ Figure 3: System Power Mode 1 16 32 31 17 30 Figure 4: AutoStore™ Inhibit Mode 1 16 32 31 17 30 *If HSB is not used, it should be left unconnected. |
类似零件编号 - STK14C88-W45 |
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类似说明 - STK14C88-W45 |
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