uaa3515a NXP Semiconductors, uaa3515a Datasheet - Page 21

• Manufacturer Part Number: uaa3515a
• Description: 900 Mhz Analog Cordless Telephone Ic
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.9.2
Table 8 Active mode bit selection; note 1
Note
1. See details on activated blocks in Section 7.1.2.
7.9.3
The crystal oscillator produces a reference frequency that
is divided and buffered to drive a microcontroller. Table 9
gives the division ratios. The buffer is a CMOS output
which can drive up to 20 pF at 10 MHz in both CLKO level
modes.
Table 9 Clock division register
2002 Sep 09
900 MHz analog cordless telephone IC
BIT 1
BIT 2
A
0
1
1
C
CTIVE MODES
LOCK OUTPUT DIVIDER
0
0
0
0
1
1
BIT 0
X
0
1
BIT 1
0
0
1
1
0
0
DESCRIPTION
inactive mode
active mode
RX mode
BIT 0
0
1
0
1
0
1
21
When the clock output signal is used, an external RC filter
connected to pin CLKOUT can be added to limit clock
waveform edges and therefore clock radiation on the
printed-circuit board.
To supply the clock to the microcontroller and save current
in the handset, an external low power resonator may be
used and the clock output disabled (000) as well as the
crystal oscillator (Xtal active = 0). In power saving mode,
the divider ratio can be programmed down to 128 to
reduce the microcontroller power consumption.
SELECT
0
1
2
3
4
5
CLOCK DIVISION RATIO
output disabled
Product specification
UAA3515A
128
2.5
2
4
1