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ST10F273E Datasheet(PDF) 12 Page - STMicroelectronics |
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ST10F273E Datasheet(HTML) 12 Page - STMicroelectronics |
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12 / 179 page  Introduction ST10F273E 12/179 CLKOUT function can output either the CPU clock (like in ST10F269) or a software programmable prescaled value of the CPU clock. On-chip RAM memory and FLASH size have been increased. PLL multiplication factors have been adapted to new frequency range. A/D Converter is not fully compatible versus ST10F269 (timing and programming model). Formula for the conversion time is still valid, while the sampling phase programming model is different. Besides, additional 8 channels are available on P1L pins as alternate function: The accuracy reachable with these extra channels is reduced with respect to the standard Port5 channels. External Memory bus is affected by limitations on maximum speed and maximum capacitance load: ST10F273E is not able to address an external memory at 64 MHz with 0 wait states. XPERCON register bit mapping modified according to new peripherals implementation (not fully compatible with ST10F269). Bondout chip for emulation (ST10R201) cannot achieve more than 50MHz at room temperature (so no real time emulation possible at maximum speed). Input section characteristics are different. The threshold programmability is extended to all port pins (additional XPICON register); it is possible to select standard TTL (with up to 400mV of hysteresis) and standard CMOS (with up to 750mV of hysteresis). Output transition is not programmable. CAN module is enhanced: ST10F273E implements two C-CAN modules, so the programming model is slightly different. Besides, the possibility to map in parallel the two CAN modules is added (on P4.5/P4.6). On-chip main oscillator input frequency range has been reshaped, reducing it from 1 to 25 MHz down to 4 to 8 MHz. This is a low power oscillator amplifier, that allows a power consumption reduction when Real Time Clock is running in Power down mode, using as reference the on-chip main oscillator clock. When this on-chip amplifier is used as reference for Real Time Clock module, the Power-down consumption is dominated by the consumption of the oscillator amplifier itself. A second on-chip oscillator amplifier circuit (32 kHz) is implemented for low power modes: it can be used to provide the reference to the Real Time Clock counter (either in Power down or Stand-by mode). Pin XTAL3 and XTAL4 replace a couple of VDD/VSS pins of ST10F269. |
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