PCB | Function | |
Offset | ||
| ||
|
| |
20H | Interrupt Vector | |
|
| |
22H | Specific EOI | |
|
| |
24H | Reserved | |
|
| |
26H | Reserved | |
|
| |
28H | Interrupt Mask | |
|
| |
2AH | Priority Mask | |
|
| |
2C | ||
|
| |
2E | Interrupt Request | |
|
| |
30 | Interrupt Status | |
|
| |
32 | TMR0 Interrupt Control | |
|
| |
34 | DMA0 Interrupt Control | |
|
| |
36 | DMA1 Interrupt Control | |
|
| |
38 | TMR1 Interrupt Control | |
|
| |
3A | TMR2 Interrupt Control | |
|
| |
3C | Reserved | |
|
| |
3E | Reserved | |
|
|
Figure 4. 80C186EA Slave Mode Peripheral
Control Block Registers
DMA Control Unit
The 80C186EA DMA Contol Unit provides two inde- pendent
80C186EA/80C188EA, 80L186EA/80L188EA
Chip-Select Unit
The 80C186EA
Refresh Control Unit
The Refresh Control Unit (RCU) automatically gen- erates a periodic memory read bus cycle to keep dynamic or
A
Power Management
The 80C186EA has three operational modes to con- trol the power consumption of the device. They are Power Save Mode, Idle Mode, and Powerdown Mode.
Power Save Mode divides the processor clock by a programmable value to take advantage of the fact that current is linearly proportional to frequency. An unmasked interrupt, NMI, or reset will cause the 80C186EA to exit Power Save Mode.
Idle Mode freezes the clocks of the Execution Unit and the Bus Interface Unit at a logic zero state while all peripherals operate normally.
Powerdown Mode freezes all internal clocks at a logic zero level and disables the crystal oscillator. All internal registers hold their values provided VCC is maintained. Current consumption is reduced to tran- sistor leakage only.
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