HD64F36912GFH Renesas Electronics America, HD64F36912GFH Datasheet - Page 106

• 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
5.3.1
The LSI system clock is generated by the on-chip oscillator clock after a reset. The on-chip
oscillator clock is switched to the external clock by the user software.
Rev. 3.00 Sep. 14, 2006 Page 76 of 408
REJ09B0105-0300
LSI operates on on-chip oscillator RC clock
LSI operates on external oscillator
Write 1 to OSCSEL in CKCSR
Write 0 to CKSWIE in CKCSR
Write 1 to PMRC0 in CKCSR
Write 1 to PMRC1 in CKCSR
Clock Control Operation
external clock? (CKSTA in
Start (reset)
Figure 5.3 Flowchart of Clock Switching On-chip Oscillator
CKCSR is 1)
Switched to
Yes
Clock to External Clock (1)
No
[1]
[2]
[3]
[1] External oscillation starts when pins PC1 and PC0
[2] After writing 1 to the OSCSEL bit, this LSI waits
[3] While the system is waiting for the external
are selected as external oscillation pins. Write 0 to
bit PMRC1 to input the external clock.
until the oscillation of the external oscillator
settles. The correspondence between Nwait,
which is the number of wait cycles for oscillation
settling, and Nstby, which is the number of wait
cycles for oscillation settling when returning from
standby mode, is as follows:
Nstby
Nstby is set by bits STS 2 to 0 in SYSCR1.
For details, see section 6.1.1, System Control
Register 1 (SYSCR1).
oscillation settling, this LSI is not halted but
continues to operate on the on-chip oscillator clock.
Read the value of the CKSTA bit in CKCSR to
ensure that the system clocks are switched.
Nwait
2
Nstby