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.
Summary of Contents for SH7780 Series
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Page 82: ...Section 1 Overview Rev 1 00 Dec 13 2005 Page 32 of 1286 REJ09B0158 0100 ...
Page 122: ...Section 3 Instruction Set Rev 1 00 Dec 13 2005 Page 72 of 1286 REJ09B0158 0100 ...
Page 146: ...Section 4 Pipelining Rev 1 00 Dec 13 2005 Page 96 of 1286 REJ09B0158 0100 ...
Page 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Page 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
Page 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
Page 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
Page 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Page 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Page 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
Page 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
Page 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
Page 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
Page 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
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