Cypress CY7C67300 manual CPU Speed Definition Processor Speed

										CY7C67300
CPU Speed Register [0xC008] [R/W]
Table 26. CPU Speed Register
Bit #	15	14		13	12		11	10	9		8
Field						Reserved...
Read/Write	-	-		-	-		-	-	-		-
Default	0	0		0	0		0	0	0		0
Bit #	7	6		5	4		3	2	1		0
Field			...Reserved					CPU Speed
Read/Write	-	-		-	-		R/W	R/W	R/W		R/W
Default	0	0		0	0		1	1	1		1

Register Description

The CPU Speed register allows the processor to operate at a user selected speed. This register only affects the CPU, all other peripheral timing is still based on the 48 MHz system clock (unless otherwise noted).

CPU Speed (Bits[3:0])

The CPU Speed field is a divisor that selects the operating speed of the processor as defined in Table 27.

Table 27. CPU Speed Definition

CPU Speed [3:0]	Processor Speed
0000	48 MHz/1
0001	48 MHz/2
0010	48 MHz/3
0011	48 MHz/4
0100	48 MHz/5
0101	48 MHz/6
0110	48 MHz/7
0111	48 MHz/8
1000	48 MHz/9
1001	48 MHz/10
1010	48 MHz/11
1011	48 MHz/12
1100	48 MHz/13
1101	48 MHz/14
1110	48 MHz/15
1111	48 MHz/16

Reserved

Write all reserved bits with ’0’.

Document #: 38-08015 Rev. *J Page 18 of 99

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