R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 40

• 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. Clock Generation Circuit
Table 6.1 Clock Generation Circuit Specifications
Oscillator status
after reset
Oscillation starts
and stops
Other
NOTES:
The clock generation circuit contains two oscillator circuits as follows:
• Main clock oscillation circuit
• On-chip oscillator (with oscillation stop detection function)
Table 6.1 lists the clock generation circuit specifications. Figure 6.1 shows the clock generation circuit.
Figures 6.2 to 6.4 show the clock-related registers.
Pins to connect
oscillator
Use of clock
Clock frequency
Usable oscillator
1. Can be used as P4
circuit is not used.
Item
Jan 27, 2006
clock can be input
Present
Stopped
Externally derived
• CPU clock source
• Peripheral function
X
• Ceramic resonator
• Crystal oscillator
0 to 20 MHz
clock source
IN
6
, X
page 29 of 205
and P4
oscillation circuit
OUT ( 1)
Main clock
7
when the on-chip oscillator clock is used for CPU clock while the main clock oscillation
• CPU clock source
• Peripheral function clock source
• CPU and peripheral function
Present
Stopped
Approx. 8 MHz
(Note 1)
clock sources when the main
clock stops oscillating
High-speed on-chip oscillator
On-chip oscillator
• CPU clock source
• Peripheral function clock source
• CPU and peripheral function
(Note 1)
Present
Oscillating
Approx. 125 kHz
clock sources when the main
clock stops oscillating
Low-speed on-chip oscillator
6. Clock Generating Circuit