The following table shows the SYSAPBCLK_CTRL Register bit assignments.
Table 4-34 SYSAPBCLK_CTRL Register bit assignments
Bits
Name
Type
Function
[31:12] -
-
Reserved.
[11:8]
CLKSEL_CUR
RO
Current value of source for
SYSAPBCLK
:
0b0001
: Source is
REFCLK
.
0b0010
: Source is divided
SYSPLLCLK
.
[7:4]
-
-
Reserved.
[3:0]
CLKSEL
RW
Select source for
SYSAPBCLK
:
0b0001
: Select
REFCLK
.
0b0010
: Select divided
SYSPLLCLK
.
Reset value
0b0010
.
Note
The example values in this register, and the clock frequency they generate, are part of a clock
configuration which enables correct operation of the N1 SoC. Further SoC testing and measurement, by
Arm or by other developers, might result in new register values.
4.5.4
SYSAPBCLK _DIV Register
The SYSAPBCLK _DIV Register characteristics are:
Purpose
Controls the
SYSAPBCLK
division value from
SYSPLLCLK
.
Usage constraints
Bits[20:16] are read-only. Bits[4:0] are read/write.
Configurations
Available in all N1 board configurations.
Memory offset and full register reset value
See
4.5.1 Serial Configuration Control registers summary
The following table shows the SYSAPBCLK _DIV Register bit assignments.
Table 4-35 SYSAPBCLK _DIV Register bit assignments
Bits
Name
Type
Function
[31:21] -
-
Reserved.
[20:16] CLKDIV_CUR
RO
Current clock divider value.
Division value=CLK1.
4 Programmers model
4.5 Serial Configuration Control registers
101489_0000_02_en
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