R5F21122FP#U0 Renesas Electronics America, R5F21122FP#U0 Datasheet - Page 35

• Manufacturer Part Number: R5F21122FP#U0
• Description: IC R8C MCU FLASH 8K 32LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/12r

Specifications of R5F21122FP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: SIO, UART/USART
• Peripherals: LED, WDT
• Number Of I /o: 22
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 32-LQFP
• For Use With: R0K521134S000BE - KIT EVAL STARTER FOR R8C/13R0E521134EPB00 - KIT EMULATOR PROBE FOR PC7501R0E521134CPE00 - EMULATOR COMPACT R8C/13
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/12 Group
Rev.1.20
REJ09B0110-0120
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
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
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
Jan 27, 2006
RING
AD
RING
clock is produced from the main clock is used for the A/D converter.
and f
runs at the same frequency as the on-chip oscillator, and can be used as the source for the
SIO
SIO
RING128
(j=1, 8, 32) is derived from the main clock or on-chip oscillator clock by dividing them by
RING128
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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 used for Timer C.
AD
, f
RING
1SIO
, f
and f
6.3 CPU Clock and Peripheral Function Clock
8SIO
SIO
, and f
RING128
, f
32SIO
AD
)
are not turned off.
are turned off.