H8SX1520R Datasheet, PDF (718/826 Pages) Renesas Technology Corp – 32-Bit CISC Microcomputer H8SX Family H8SX/1500 Series

Section 18 Clock Pulse Generator
Initial
Bit
Bit Name Value R/W Description
6
PCK2
0
R/W Peripheral Module Clock (Pφ) Select
5
PCK1
1
4
PCK0
0
R/W These bits select the frequency of the peripheral module
R/W ^{clock. The ratio to the input clock is as follows:}
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.
3

0
R/W Reserved
This bit is always read as 0. The write value should
always be 0.
2
BCK2
0
R/W External clock (Bφ) Select
1
BCK1
1
0
BCK0
0
R/W These bits select the frequency of the external clock. The
R/W ^{ratio to the input clock is as follows:}
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.
[Legend]
X:
Don't care
Rev. 1.00 Mar. 06, 2006 Page 680 of 784
REJ09B0282-0100