M306H7MG-XXXFP Datasheet, PDF (25/329 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

M306H7MG-XXXFP/MC-XXXFP/FGFP
4. CLOCK GENERATION CIRCUIT
4. Clock Generation Circuit
The clock generation circuit contains two oscillator circuits as follows:
(1) Main clock oscillation circuit
(2) Sub clock oscillation circuit
Table 4.1 lists the clock generation circuit specifications. Figure 4.1 shows the clock generation circuit.
Figures 4.2 to 4.4 show the clock-related registers.
Table 4.1 CPU registers
Item
Use of clock
Main clock
oscillation circuit
Sub clock
oscillation circuit
• CPU clock source •CPU clock source
• Peripheral function • Timer A, B's clock
clock source
source
Clock frequency
Usable oscillator
Pins to connect
oscillator
0 to 16 MHz
(Note 3)
• Ceramic oscillator
• Crystal oscillator
(Note 2)
XIN, XOUT
32.768 kHz
• Crystal oscillator
XCIN, XCOUT
Oscillation stop, Presence
restart function
Presence
Oscillator status Oscillating
after reset (Note1)
Stopped
Other
Externally derived clock can be input
Note 1. The state that the STARTB pin is held "L" after reset is shown.
The state that the STARTB pin is held "H" after reset is following.
Main clock oscillation circuit: Stopped
Sub clock oscillation circuit: Oscillating
Note 2. If you use "14 Expansion Function (Data acquisition)", be sure to connect a crystal oscillator
between the XIN and XOUT pins.
Note 3. If you use "14 Expansion Function (Data acquisition)", connect a crystal of 10MHz, 12MHz,
14MHz, or 16MHz.
Rev.2.10 Oct 25, 2006 Page 25 of 326
REJ03B0152-0210