m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 72

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

1. While pin RESET = “L” level and after reset, the PLL frequency multiplier is inactive. Clear the PLL circuit
3. To change the multiplication ratio for the PLL frequency multiplier, clear the system clock select bit (bit
[Precautions for clock generating circuit]
2. To select f
f(X
After reset, the PLL multiplication ratio select bits are allowed to be changed only once. If it is necessary
to write a certain value to these bits, be sure to write the same value that has been written after the latest
reset.
operation enable bit (bit 1 at address BC
5 at address BC
rewriting of the PLL multiplication ratio select bits (bits 2, 3 at address BC
IN
) has been stabilized. (See Figure 4.2.3.)
PLL
as f
16
sys
) to “0” simultaneously. Then, set the system clock select bit to “1” 2 ms after the
after reset, set the system clock select bit (bit 5 at address BC
7905 Group User’s Manual Rev.1.0
16
) to “0” if the PLL frequency multiplier needs not to be active.
CLOCK GENERATING CIRCUIT
[Precautions for clock generating circuit]
16
). (See Figure 4.2.3.)
16
) to “1” 2 ms after
4-11