HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 207

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

10.4 Operation
10.4.1 FRC Incrementation Timing
The FRC increments on a pulse generated once for each period of the selected (internal or
external) clock source.
If external clock input is selected, the FRC increments on the rising edge of the clock signal.
Figure 10-3 shows the increment timing.
< Upper byte read >
< Lower byte read >
CPU wites
data H’AA
CPU wites
data H’55
Figure 10-2 (b) Read Access to FRC (When FRC Contains H'AA55)
Bus interface
Bus interface
190
[H’AA]
FRCH
FRCH
[
]
TEMP
TEMP
[H’55]
[H’55]
[
FRCL
[H’55]
FRCL
Module data bus
Module data bus
]