psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 38

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

Data Sheet
2.1.3
The microcontroller clock is provided by the pin MCLK. Five clock rates are selectable by
a programmable prescaler (see chapter clock generation figure 78) which is controlled
by the MODE1.MCLK bit corresponding following table. By setting the clock divider
selection bit (MODE1.CDS) a doubled MCLK frequency is available.
The possible MCLK frequencies are listed in table 4.
Table 4
MCLK Frequencies
The clock rate is changed after CS becomes inactive.
MCLK
Bits
’00’
’01’
’10’
’11’
Microcontroller Clock Generation
with MODE1.CDS = ’0’
MCLK Frequency
3.84 MHz (default)
0.96 MHz
7.68 MHz
disabled
28
with MODE1.CDS = ’1’
MCLK Frequency
7.68 MHz (default)
15.36 MHz
1.92 MHz
disabled
PSB 21391
PSB 21393
Interfaces
2001-03-07