CY8C20X34 CYPRESS [Cypress Semiconductor], CY8C20X34 Datasheet - Page 190

• Manufacturer Part Number: CY8C20X34
• Description: Technical Reference Manual (TRM)
• Manufacturer: CYPRESS [Cypress Semiconductor]

OSC_CR2
20.4.8
This register is used to configure various features of internal clock sources and clock nets.
In the table above, note that reserved bits are grayed table cells and are not described in the bit description section below.
Reserved bits should always be written with a value of ‘0’. For additional information, refer to the
94
Bit
2
1
190
Individual Register Names and Addresses:
OSC_CR2: 1,E2h
Access : POR
Bit Name
1,E2h
in the Digital Clocks chapter.
EXTCLKEN
IMODIS
Name
OSC_CR2
Oscillator Control Register 2
7
6
Description
External Clock Mode Enable
0
1
Internal Oscillator Disable. Bit can be set to save power when using an external clock on P1[4].
0
1
Disabled. Operate from internal main oscillator.
Enabled. Operate from clock supplied at P1[4].
Enabled. Internal oscillator enabled.
Disabled.
Note This bit must not be set high in the same instruction that sets EXTCLKEN high, but it
can be set in the next instruction. Also, this bit must not be set high if the external clock fre-
quency is less than 6 MHz.
When switching from external clock to internal clock, the IMO must be enabled for at least
10 µ s before the transition to internal clock. Refer to
5
4
3
EXTCLKEN
RW : 0
PSoC CY8C20x34 TRM, Version 1.0
2
Switch Operation on page
1,E2h
Register Definitions on page
IMODIS
RW : 0
1
92.
0