r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 112

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
9.
9.1
Table 9.1
Notes:
Applications
Clock frequency
Connectable oscillator
Oscillator connect pins
Oscillation start and stop
State after reset
Others
The following five circuits are included in the clock generation circuit:
• XIN clock oscillation circuit
• XCIN clock oscillation circuit
• Low-speed on-chip oscillator
• High-speed on-chip oscillator
• Low-speed on-chip oscillator for the watchdog timer
Table 9.1 lists the Clock Generation Circuit Specifications, Figure 9.1 shows the Clock Generation Circuit Block
Diagram. Figure 9.2 shows the Supply of Peripheral Function Clocks, and Table 9.2 lists the Clock Generation
Circuit Pin Configuration.
Clock Generation Circuit
1. When the on-chip oscillator clock is used as the CPU clock without using the XIN clock oscillation circuit, these pins can be used as P4_6 and
2. When the XIN clock oscillation circuit or the on-chip oscillator clock is used as the CPU clock without using the XCIN clock oscillation circuit,
3. When inputting an external clock, set the CM05 bit in the CM0 register to 0 (oscillates), the CM07 bit in the CM0 register to 1 (external clock input
4. When the high-speed on-chip oscillator is used as the CPU clock source, the frequency will be a maximum of 20 MHz, which is set by the divider.
5. This applies when the CSPROINI bit in the OFS register is 1 (count source protection mode disabled after reset).
6. This applies when the CSPROINI bit is 0 (count source protection mode enabled after reset)
P4_7.
these pins can be used as P4_3 and P4_4.
from XOUT), and the CM13 bit in the CM1 register to 1 (XIN-XOUT pin).
Overview
Item
Preliminary document
Specifications in this document are tentative and subject to change.
Clock Generation Circuit Specifications
• CPU clock source
• Peripheral function
• Ceramic resonator
• Crystal oscillator
• An externally
XIN Clock Oscillation
clock source
generated clock can
be input.
XIN, XOUT
0 to 20 MHz
Stopped
Usable
Circuit
(3)
(1)
XCIN Clock Oscillation
• CPU clock source
• Peripheral function
• Crystal oscillator
• An externally
• A feedback resistor
clock source
generated clock can
be input.
Rf is included
(connected or not
connected can be
selected).
XCIN, XCOUT
32.768 kHz
Stopped
Usable
Circuit
(2)
• CPU clock source
• Peripheral function clock source
• CPU and peripheral function clock sources
when the XIN clock oscillation stops.
On-Chip Oscillator
Approx.40 MHz
High-Speed
(4)
Oscillators
Stopped
Usable
—
—
—
(1)
On-Chip Oscillator
Approx.125 kHz
Low-Speed
9. Clock Generation Circuit
• Watchdog timer
Low-Speed On-Chip
clock source
Watchdog Timer
Approx. 125 kHz
Oscillator for
Oscillates
Page 81 of 725
Stopped
Usable
—
—
—
(5)
(6)