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AT17F040-30CC Datasheet(PDF) 6 Page - ATMEL Corporation |
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AT17F040-30CC Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 19 page 6 3039I–CNFG–2/05 AT17F040/080 5.4 PAGESEL[1:0](2) Page select inputs. Used to determine which of the 4 memory pages are targeted during a serial configuration download. The address space for each of the pages is shown in Table 5-2. When SER_EN is Low (ISP mode) these pins have no effect. 5.5 RESET/OE(1) Output Enable (active High) and RESET (active Low) when SER_EN is High. A Low level on RESET/OE resets both the address and bit counters. A High level (with CE Low) enables the data output driver. 5.6 CE(1) Chip Enable input (active Low). A Low level (with OE High) allows CLK to increment the address counter and enables the data output driver. A High level on CE disables both the address and bit counters and forces the device into a low-power standby mode. Note that this pin will not enable/disable the device in the 2-wire Serial Programming mode (SER_EN Low). 5.7 GND Ground pin. A 0.2 µF decoupling capacitor between V CC and GND is recommended. 5.8 CEO Chip Enable Output (when SER_EN is High). This output goes Low when the internal address counter has reached its maximum value. If the PAGE_EN input is set High, the maximum value is the highest address in the selected partition. The PAGESEL[1:0] inputs are used to make the 4 partition selections. If the PAGE_EN input is set Low, the device is not partitioned and the address maximum value is the highest address in the device, see Table 5-2 on page 6. In a daisy chain of AT17F Series devices, the CEO pin of one device must be connected to the CE input of the next device in the chain. It will stay Low as long as CE is Low and OE is High. It will then follow CE until OE goes Low; thereafter, CEO will stay High until the entire EEPROM is read again. Notes: 1. This pin has an internal 20 K Ω pull-up resistor. 2. This pin has an internal 30 K Ω pull-down resistor. Table 5-2. Address Space Paging Decodes AT17F040 (4 Mbits) AT17F080 (8 Mbits) PAGESEL = 00, PAGE_EN = 1 00000 – 0FFFFh 00000 – 1FFFFh PAGESEL = 01, PAGE_EN = 1 10000 – 1FFFFh 20000 – 3FFFFh PAGESEL = 10, PAGE_EN = 1 20000 – 2FFFFh 40000 – 5FFFFh PAGESEL = 11, PAGE_EN = 1 30000 – 3FFFFh 60000 – 7FFFFh PAGESEL = XX, PAGE_EN = 0 00000 – 3FFFFh 00000 – 7FFFFh |
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