HD64F36077GHV Renesas Electronics America, HD64F36077GHV Datasheet - Page 112

• Manufacturer Part Number: HD64F36077GHV
• Description: 16BIT MCU FLASH 56K, SMD, LQFP64
• Manufacturer: Renesas Electronics America

Specifications of HD64F36077GHV

• No. Of I/o's: 47
• Ram Memory Size: 4KB
• Cpu Speed: 20MHz
• No. Of Timers: 4
• Digital Ic Case Style: LQFP
• Supply Voltage Range: 4.5V
• Core Size: 16bit
• Program Memory Size: 56KB
• Oscillator Type: External Only
• Controller Family/series: H8/300H
• Peripherals: ADC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Section 5 Clock Pulse Generator
5.4
Users can trim the on-chip oscillator clock, supplying the external reference pulses with the input
capture function in internal timer Z. An example of trimming flow and a timing chart are shown in
figures 5.9 and 5.10, respectively. Because RCTRMDR is initialized by a reset, when users have
trimmed the frequencies, some operations after a reset are necessary, such as trimming it again or
saving the trimming value in an external device for later reloading.
Rev. 1.00 Sep. 16, 2005 Page 82 of 490
REJ09B0216-0100
Note: * Comparing the difference between the measured frequency and the desired frequency,
Trimming of On-Chip Oscillator Frequency
Figure 5.9 Example of Trimming Flow for On-Chip Oscillator Clock
individual bits of RCTRMDR are decided from the MSB bit by bit.
Input reference pulses to
Set RCTRMDR to H'00
Frequency calculation
GRC: Buffer of GRA
GRA: Input capture
pin P60/FTIOA0
desired frequency
Setting timer Z
Capture 1
Capture 2
range?
Within
Start
End
Yes
No
Modify RCTRMDR*