HD64F36912GFH Renesas Electronics America, HD64F36912GFH Datasheet - Page 110

• Manufacturer Part Number: HD64F36912GFH
• Description: IC H8 MCU FLASH 8K 32-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300H Tinyr

Specifications of HD64F36912GFH

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 12MHz
• Connectivity: I²C, SCI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Section 5 Clock Pulse Generators
5.4
Users can trim the on-chip oscillator frequency, supplying the external reference pulses with the
input capture function in internal timer W. An example of trimming flow and a timing chart are
shown in figures 5.7 and 5.8, respectively. Because RCTRMDR is initialized by a reset, when
users have trimmed the oscillators, 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. 3.00 Sep. 14, 2006 Page 80 of 408
REJ09B0105-0300
Note: * Comparing the difference between the measured frequency and the desired frequency,
Trimming of On-chip Oscillator Frequency
Figure 5.7 Example of Trimming Flow for On-chip Oscillator Frequency
individual bits of RCTRMDR are decided from the MSB bit by bit.
Input reference pulses to
Frequency calculation
Set RCTRMD to H'00
GRC: Buffer of GRA
GRA: Input capture
desired frequency
Setting timer W
pin P81/FTIOA
Capture 1
Capture 2
range?
Within
Start
End
Yes
No
Modify RCTRMDR*