Figure 12-1. CPU Clock Block Diagram

CY7C601xx, CY7C602xx

Figure 12-1. CPU Clock Block Diagram

 

 

 

 

 

EN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P0.1

 

 

 

 

 

 

 

 

CLKOUT

 

 

 

 

XTAL OSC

 

 

 

 

 

 

 

 

 

 

1-24MHz

P0.0

 

 

 

 

 

 

 

 

CLKIN

 

 

 

CY7C601xx only

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Crystal Oscillator Disabled

LP OSC 32-KHz

CPUCLK

SEL

CLK_EXT

MUX

CLK_24MHz

XOSC

SEL

MUX

CLK_32KHz

SCALE

(divide by 2n, n = 0-5,7)

Doubler

EFTB

 

 

CLK_EXT

 

 

 

 

 

CY7C601xx only

CLK_CPU

CLK_HS

Table 12-2. CPU Clock Configuration (CPUCLKCR) [0x30] [R/W]

Bit #

7

6

5

4

3

2

1

0

Field

 

 

 

Reserved

 

 

 

CPUCLK Select

Read/Write

R/W

Default

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

Bit [7:1]: Reserved

Bit 0: CPU CLK Select

0 = Internal 24 MHz Oscillator

1 = External oscillator source

Note The CPU speed selection is configured using the OSC_CR0 Register (Table 12-3).

Table 12-3. OSC Control 0 (OSC_CR0) [0x1E0] [R/W]

Bit #

7

 

6

5

4

3

2

1

 

0

Field

 

Reserved

No Buzz

Sleep Timer [1:0]

 

CPU Speed [2:0]

 

 

 

 

 

 

 

 

 

 

 

 

Document 38-16016 Rev. *E

Page 23 of 68

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Cypress CY7C602xx 1. CPU Clock Block Diagram, 2. CPU Clock Configuration CPUCLKCR 0x30 R/W, Bit 71 Reserved, + Feedback