HD6413308 Hitachi Semiconductor, HD6413308 Datasheet - Page 154

• Manufacturer Part Number: HD6413308
• Description: Hitachi Single-Chip MicroComputer
• Manufacturer: Hitachi Semiconductor

6.4 Operation
6.4.1 FRC Incrementation Timing
The FRC increments on a pulse generated once for each period of the selected (internal or external)
clock source.
The internal clock sources are created from the system clock (Ø) by a prescaler. The FRC
increments on a pulse generated from the falling edge of the prescaler output. See Figure 6-5.
(1) Upper byte read
(2) Lower byte read
CPU writes
data H’AA
CPU writes
data H’55
Figure 6-4 (b). Read Access to FRC (When FRC Contains H’AA55)
Bus interface
Bus interface
139
FRC H
[
FRC H
[H’AA]
]
TEMP
[H’55]
TEMP
[H’55]
FRC L
[
FRC L
[H’55]
Module data bus
Module data bus
]