R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 47

• Manufacturer Part Number: R5F21133DFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

R8C/13 Group
Rev.1.20
REJ09B0111-0120
6.3 CPU Clock and Peripheral Function Clock
There are two types of clocks: CPU clock to operate the CPU and peripheral function clock to operate the
peripheral functions. Also refer to “Figure 6.1 Clock Generating Circuit”.
6.3.1 CPU Clock
6.3.2 Peripheral Function Clock (f
6.3.3 f
6.3.4 f
This is an operating clock for the CPU and watchdog timer.
The clock source for the CPU clock can be chosen to be the main clock or on-chip oscillator clock.
The selected clock source can be divided by 1 (undivided), 2, 4, 8 or 16 to produce the CPU clock. Use
the CM06 bit in the CM0 register and the CM17 to CM16 bits in the CM1 register to select the divide-
by-n value.
After reset, the low-speed on-chip oscillator clock divided by 8 provides the CPU clock.
Note that when entering stop mode from high or middle speed mode, the CM06 bit is set to “1” (divide-
by-8 mode).
These are operating clocks for the peripheral functions.
Of these, fi (i=1, 2, 8, 32) is derived from the main clock or on-chip oscillator clock by dividing them by
i. The clock fi is used for timers X, Y, Z and C.
The clock fj
j. The clock fj
The f
converter.
When the WAIT instruction is executed after setting the CM02 bit in the CM0 register to “1” (peripheral
function clock turned off during wait mode), the clocks fi, fj
These are operating clocks for the peripheral functions.
The f
timer Y. The f
When the WAIT instruction is executed, the clocks f
This is used as the count source for the timer C. The f
oscillator and provided by setting the HR00 bit to “1” (high-speed on-chip oscillator on).
When the WAIT instruction is executed, the clock f
Jan 27, 2006
RING
AD
RING
RING
clock is produced from the main clock or the on-chip oscillator clock and is used for the A/D
-fast
runs at the same frequency as the on-chip oscillator, and can be used as the souce for the
and f
SIO
SIO
RING128
(j=1, 8, 32) is derived from the main clock or on-chip oscillator clock by dividing them by
page 36 of 205
RING128
is used for serial interface.
is derived from the f
1
, f
2
, f
8
, f
RING
32
, f
by dividing it by 128, and can be used for Timer C.
AD
, f
RING
RING
1SIO
RING
-fast is not turned off.
, f
and f
6.3 CPU Clock and Peripheral Function Clock
-fast is derived from the high-speed on-chip
SIO
8SIO
, and f
RING128
, f
32SIO
AD
, f
are not turned off.
are turned off.
RING
, f
RING128
)