Section 15 Clock Pulse Generator (CPG)
Rev.1.00 Dec. 13, 2005 Page 613 of 1286
REJ09B0158-0100
Section 15 Clock Pulse Generator (CPG)
The CPG generates clocks provided to both the inside and outside of the SH7780, and controls the
power-down mode function. The CPG comprises a crystal oscillator circuit, PLLs, and a divider.
15.1 Features
The CPG has the following features.
•
Generates SH7780 internal clocks
SH7780 internal clocks are: the CPU clock (Ick) which is used in the CPU, FPU, cache, and
TLB; the SHwy clock (SHck) which is used by the SuperHyway bus; and peripheral clocks
(Pck) which are used to interface with on-chip peripheral modules.
•
Generates SH7780 external bus clocks.
SH7780 external bus clocks are the bus clock (Bck) which is used to interface with the external
devices and memory clocks (DDRck) which are used in the DDRIF.
•
Selects two clock modes
Selects a crystal resonator or an externally input clock as the CPG clock input.
•
Changes frequencies
Changes frequencies of the internal clocks by the divider in the CPG. The divider is controlled
with the frequency control register (FRQCR) set by software.
•
Provides the clock stop and module standby functions in control sleep mode
Control sleep mode is the CPU stop mode. In control module standby mode, specific modules
can be stopped.
Содержание SH7780 Series
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