R5F21143DSP View Datasheet(PDF) - Renesas Electronics
Part Name
Description
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R5F21143DSP Datasheet PDF : 277 Pages
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R8C/14 Group, R8C/15 Group
9. Clock Generation Circuit
9. Clock Generation Circuit
The MCU has two on-chip clock generation circuits:
• Main clock oscillation circuit
• On-chip oscillator (oscillation stop detection function)
Table 9.1 lists Specification of Clock Generation Circuit. Figure 9.1 shows a Clock Generation Circuit.
Figures 9.2 to 9.5 show clock-associated registers.
Table 9.1 Specification of Clock Generation Circuit
Item
Use of Clock
Clock Frequency
Connectable
Oscillator
Oscillator
Connect Pins
Oscillation Stop,
Restart Function
Oscillator Status
After Reset
Others
Main Clock
On-Chip Oscillator
Oscillation Circuit High-Speed On-Chip Oscillator Low-Speed On-Chip Oscillator
• CPU clock source • CPU clock source
• Peripheral
• Peripheral function clock
• CPU clock source
• Peripheral function clock
function clock
source
source
• CPU and peripheral function
clock sources when main
clock stops oscillating
source
• CPU and peripheral function
clock sources when main
clock stops oscillating
0 to 20MHz
Approx. 8MHz
Approx. 125kHz
• Ceramic
−
−
resonator
• Crystal oscillator
XIN, XOUT(1)
(Note 1)
(Note 1)
Usable
Usable
Usable
Stop
Stop
Oscillate
Externally
−
−
generated clock
can be input
NOTES:
1. This pin can be used as P4_6 and P4_7 when using the on-chip oscillator clock for a CPU clock
while the main clock oscillation circuit is not used.
Rev.2.10 Jan 19, 2006 Page 38 of 253
REJ09B0164-0210
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