h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 603

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

20.3
The PLL circuit multiplies the frequency of the clock from the oscillator by a factor of 1, 2, or 4.
The multiplication factor is set by the STC0 bit and the STC1 bit in LPWRCR. The phase of the
rising edge of the internal clock is controlled so as to match that at the EXTAL pin.
When the multiplication factor of the PLL circuit is changed, the operation varies according to the
setting of the STCS bit in SCKCR.
When STCS = 0, the setting becomes valid after a transition to software standby mode. The
transition time count is performed in accordance with the setting of bits STS0 to STS2 in SBYCR.
For details on SBYCR, see section 21.1.1, Standby Control Register (SBYCR).
1. The initial PLL circuit multiplication factor is 1.
2. STS0 to STS2 are set to give the specified transition time.
3. The target value is set in STC0 and STC1, and a transition is made to software standby mode.
4. The clock pulse generator stops and the value set in STC0 and STC1 becomes valid.
5. Software standby mode is cleared, and a transition time is secured in accordance with the
6. After the set transition time has elapsed, this LSI resumes operation using the target
If a PC break is set for the SLEEP instruction, software standby mode is entered and break
exception handling is executed after the oscillation settling time. In this case, the instruction
following the SLEEP instruction is executed after execution of the RTE instruction. When STCS =
1, this LSI operates on the changed multiplication factor immediately after bits STC0 and STC1
are rewritten.
20.4
The medium-speed clock divider divides the system clock to generate φ/2, φ/4, φ/8, φ/16, and
φ/32.
20.5
The bus master clock selection circuit selects the clock supplied to the bus master by setting the
bits SCK 2 to 0 in SCKCR. The bus master clock can be selected from high-speed mode, or
medium-speed clocks (φ/2, φ/4, φ/8, φ/16, φ/32).
setting in STS0 to STS2.
multiplication factor.
PLL Circuit
Medium-Speed Clock Divider
Bus Master Clock Selection Circuit
Rev. 2.00 Dec. 05, 2005 Page 565 of 724
Section 20 Clock Pulse Generator
REJ09B0200-0200