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80L186EA Datasheet(PDF) 5 Page - Intel Corporation |
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80L186EA Datasheet(HTML) 5 Page - Intel Corporation |
5 / 50 page 80C186EA80C188EA 80L186EA80L188EA 272432 – 3 (A) Crystal Connection NOTE The L1C1 network is only required when using a third-overtone crystal 272432 – 4 (B) Clock Connection Figure 2 Clock Configurations 80C186EA PERIPHERAL ARCHITECTURE The 80C186EA has integrated several common sys- tem peripherals with a CPU core to create a com- pact yet powerful system The integrated peripher- als are designed to be flexible and provide logical interconnections between supporting units (eg the interrupt control unit supports interrupt requests from the timercounters or DMA channels) The list of integrated peripherals include 4-Input Interrupt Control Unit 3-Channel TimerCounter Unit 2-Channel DMA Unit 13-Output Chip-Select Unit Refresh Control Unit Power Management logic The registers associated with each integrated peri- heral are contained within a 128 x 16 register file called the Peripheral Control Block (PCB) The PCB can be located in either memory or IO space on any 256 byte address boundary Figure 3 provides a list of the registers associated with the PCB when the processor’s Interrupt Control Unit is in Master Mode In Slave Mode the defini- tions of some registers change Figure 4 provides register definitions specific to Slave Mode Interrupt Control Unit The 80C186EA can receive interrupts from a num- ber of sources both internal and external The Inter- rupt Control Unit (ICU) serves to merge these re- quests on a priority basis for individual service by the CPU Each interrupt source can be independent- ly masked by the Interrupt Control Unit or all inter- rupts can be globally masked by the CPU Internal interrupt sources include the Timers and DMA channels External interrupt sources come from the four input pins INT30 The NMI interrupt pin is not controlled by the ICU and is passed direct- ly to the CPU Although the timers only have one request input to the ICU separate vector types are generated to service individual interrupts within the Timer Unit TimerCounter Unit The 80C186EA TimerCounter Unit (TCU) provides three 16-bit programmable timers Two of these are highly flexible and are connected to external pins for control or clocking A third timer is not connected to any external pins and can only be clocked internally However it can be used to clock the other two timer channels The TCU can be used to count external events time external events generate non-repeti- tive waveforms generate timed interrupts etc 5 5 |
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