Renesas H8SX/1520 Series Hardware Manual page 702

Section 18 Clock Pulse Generator
Bit Bit Name
6 PCK2
5 PCK1
4 PCK0

3
2 BCK2
1 BCK1
0 BCK0
Note: X: Don't care
Rev. 3.00 Mar. 14, 2006 Page 664 of 804
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Initial
Value R/W Description
0 R/W Peripheral Module Clock (Pφ) Select
1 R/W These bits select the frequency of the peripheral module
clock. The ratio to the input clock is as follows:
0 R/W
000: ×8
001: ×4
010: ×2
011: ×1
1XX: Setting prohibited
The frequency of the peripheral module clock should be
lower than that of the system clock. Though these bits
can be set so as to make the frequency of the peripheral
module clock higher than that of the system clock, the
clocks will have the same frequency in reality.
0 R/W Reserved
This bit is always read as 0. The write value should
always be 0.
0 R/W External clock (Bφ) Select
1 R/W These bits select the frequency of the external clock. The
ratio to the input clock is as follows:
0 R/W
000: ×8
001: ×4
010: ×2
011: ×1
1XX: Setting prohibited
The frequency of the external clock should be lower than
that of the system clock. Though these bits can be set so
as to make the frequency of the external clock higher
than that of the system clock, the clocks will have the
same frequency in reality.