HD64F36077GHV Renesas Electronics America, HD64F36077GHV Datasheet - Page 107

• 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

Figure 5.4 Flowchart of Clock Switching with Backup Function Disabled (1)
LSI operates on external oscillator
Write 1 to OSCSEL in CKCSR
Write 0 to CKSWIF in CKCSR
Write 1 to PMRC0 in CKCSR
Write 1 to PMRC1 in CKCSR
LSI operates on on-chip oscillator clock
external clock? (CKSTA in
Start (reset)
CKCSR is 1)
Switched to
(From On-Chip Oscillator Clock to External Clock)
Yes
No
[1]
[2]
[3]
[1]
[2]
[3]
External oscillation starts to be enabled when
pins PC1 and PC0 are specified as external
clock pins. Write 0 to bit PMRC1 to input the
external clock.
After writing 1 to the OSCSEL bit, this LSI
waits 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[2:0] in SYSCR1. For
details, see section 6.1.1, System Control
Register 1 (SYSCR1).
While the system is waiting for the external
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
Rev. 1.00 Sep. 16, 2005 Page 77 of 490
2
Section 5 Clock Pulse Generator
Nstby
REJ09B0216-0100