HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 121

• Manufacturer Part Number: HD64F3437TFI16V
• Description: MCU FLASH 60K 100-TQFP
• Manufacturer: Renesas Electronics America

Specifications of HD64F3437TFI16V

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.1
The H8/3437 Series has a built-in clock pulse generator (CPG) consisting of an oscillator circuit, a
duty adjustment circuit, and a divider and a prescaler that generates clock signals for the on-chip
supporting modules.
6.1.1
Figure 6.1 shows a block diagram of the clock pulse generator.
Input an external clock signal to the EXTAL pin, or connect a crystal resonator to the XTAL and
EXTAL pins. The system clock frequency (ø) will be the same as the input frequency. This same
system clock frequency (ø
divided by two. The selection is made by software, by controlling the CKDBL bit.
EXTAL
XTAL
Overview
Block Diagram
Figure 6.1 Block Diagram of Clock Pulse Generator
Oscillator
Section 6 Clock Pulse Generator
circuit
P
) can be supplied to timers and other supporting modules, or it can be
adjustment
circuit
Duty
divider (1/2)
Frequency
ø
(system
clock)
CKDBL
ø
(for sup-
porting
modules)
P
ø
P
/2 to ø
Prescaler
P
/4096
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