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Features as an Interval Timer
•
Refresh timer counter (RTCNT) can be used as an 8-bit up-counter
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•
Selection of seven counter clock sources: ø/2, ø/8, ø/32, ø/128, ø/512, ø/2048, ø/4096
•
Interrupts can be generated by compare match between RTCNT and the refresh time constant
register (RTCOR)
7.1.2 Block Diagram
Figure 7-1 shows a block diagram of the refresh controller.
ø/2, ø/8, ø/32,
ø/128, ø/512,
ø/2048, ø/4096
Clock selector
Comparator
Legend
RTCNT:
Refresh timer counter
RTCOR:
Refresh time constant register
RTMCSR:
Refresh timer control/status register
RFSHCR:
Refresh control register
Figure 7-1 Block Diagram of Refresh Controller
Refresh signal
Control logic
Module data bus
148
CMI interrupt
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