upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 129

• Manufacturer Part Number: upd70f3422gj-gae-qs-ax
• Description: 32-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

Clock Generator
Features summary
Chapter 4 Clock Generator
4.1 Overview
The clock generator provides the clock signals needed by the CPU and the
on-chip peripherals.
The clock generator can generate the required clock signals from the following
sources:
• Main oscillator - a built-in oscillator with external crystal and a nominal
• Sub oscillator - a built-in oscillator with external crystal and a nominal
• Ring oscillator - an internal oscillator without external components and a
Special features of the clock generator are:
• Choice of oscillators to reduce power consumption in stand-by mode
• Frequency multiplication by two PLL synthesizers:
• Individual clock source selection for CPU and groups of peripherals
• Five specific power save modes:
• Vital system registers are write-protected by a special write sequence
• Direct main oscillator clock feed-through for watch clock correction support
• Separate clock monitors for main and sub oscillator to detect oscillator
Preliminary User’s Manual U17566EE1V2UM00
frequency of 4 MHz
frequency of 32 KHz
nominal frequency of 240 KHz
– Fixed frequency PLL for accurate timings
– Spread spectrum PLL (SSCG) for reduced electromagnetic interference
– HALT mode
– IDLE mode
– WATCH mode
– Sub-WATCH mode
– STOP mode
malfunction
Chapter 4
129