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User’s Manual U11969EJ3V0UM00
153
CHAPTER 6 CLOCK GENERATOR FUNCTION
The PSC register reset value is 00H in ROMless mode 1 and 2 and single-chip mode 2 and C0H in single-chip
mode 1 and PROM mode. Therefore, the CLKOUT signal is output during the reset period in ROMless mode 1 and
2 and single-chip mode 2. In single-chip mode 1, the CLKOUT signal is not output until the DCLK1 and DCLK0 bits
of the PSC register are set to “11” after reset is released (low level output).
In the PROM mode, the CLKOUT signal is not output (low level output).
6.7.3 CLO signal output control
The clock to be output to CLO pin can be selected by the FS bit of the CLOM register.
CLO pin outputs a signal which has the same level as that of the LV bit when the CLE bit is 0. Signal is output
synchronized with the clock (the frequency selected by the FS bit ) immediately after the CLE bit is set to 1.
Then, if the CLE bit is set to 0, the same level as that of the LV bit is output, and the output operation thereafter
is stopped.
Figure 6-2. CLO Signal Output Timing
(a) When LV = 0
(b) When LV = 1
Remark
n = 1, 2, 4, 8, 16
/n
CLO
CLE
φ
/n
CLO
CLE
φ
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