SH7760 Datasheet, PDF (517/1345 Pages) Renesas Technology Corp – SuperHTM RISC engine

CKIO pin. Starting and stopping of this circuit is controlled by the setting of the frequency
control register.
(3) PLL Circuit 3
PLL circuit 3 coordinates the phases of the bus clock and the clock signal output from the
DCK pin. Starting and stopping of this circuit is controlled by the setting of the clock
division register.
(4) Crystal Oscillator
Oscillation circuits for when a crystal resonator is connected to the XTAL and EXTAL pins.
Usage of the crystal oscillator is enabled by the MD8 pin setting.
(5) Frequency Divider 1
Frequency divider 1 generates the CPU clock (Ick), bus clock (Bck), and peripheral clock
(Pck). The division ratio is set in the frequency control register.
(6) Frequency Divider 2
Frequency divider 2 generates the clock output from the DCK pin. The division ratio is set in
the clock division register.
(7) Frequency Divider 3
Frequency divider 3 generates the module clock (Fck). The division ratio is set in the module
clock control register.
(8) Clock Frequency Control Circuit
The clock frequency control circuit controls the clock frequency by means of the MD pins,
frequency control register, clock division register, and module clock control register.
(9) Standby Control Circuit
The standby control circuit controls the state of the on-chip oscillation circuits and other
modules when the clock is switched or in sleep and standby modes.
(10) Frequency Control Register (FRQCR)
FRQCR contains control bits for the clock output from the CKIO pin, on/off of PLL circuits
1 and 2, and frequency division ratios of the CPU clock, bus clock, and peripheral clock.
(11) Clock Division Register (DCKDR)
DCKDR contains control bits for the clock output from the DCK pin, on/off of PLL circuit 3,
division ratio of the DCK output clock, and enable/disable of the DCK output clock.
(12) Module Clock Control Register (MCKCR)
MCKCR contains control bits for the division ratio of the module clock.
Rev. 1.0, 02/03, page 467 of 1294