CHAPTER 5 CLOCK GENERATION FUNCTION
User’s Manual U16896EJ2V0UD
134
5.5 PLL Function
5.5.1 Overview
The PLL function is used to output the operating clock of the CPU and on-chip peripheral function at a frequency 4
times higher than the oscillation frequency, and select the clock-through mode.
When PLL function is used: Input clock = 2 to 5 MHz (f
XX
: 8 to 20 MHz)
Clock-through mode:
Input clock = 2 to 10 MHz (f
XX
: 2 to 10 MHz)
5.5.2 Register
(1) PLL control register (PLLCTL)
The PLLCTL register is an 8-bit register that controls the security function of PLL and RTO.
This register can be read or written in 8-bit or 1-bit units.
Reset sets this register to 01H.
0
PLLCTL
0
0
0
0
RTOST0
Note
SELPLL
PLLON
PLL stopped
PLL operating
PLLON
0
1
PLL operation control
Clock-through operation
PLL operation
SELPLL
0
1
PLL clock selection
After reset: 01H R/W Address: FFFFF806H
< >
< >
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Note
For the RTOST0 bit, refer to
CHAPTER 12 REAL-TIME OUTPUT FUNCTION (RTO)
.
Caution Be sure to clear bits 4 to 7 to “0”. Changing bit 3 does not affect the operation.
Содержание V850ES/KE1+
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