HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 162

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

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