pcd3349a NXP Semiconductors, pcd3349a Datasheet - Page 6

• Manufacturer Part Number: pcd3349a
• Description: 8-bit Microcontroller With Dtmf Generator
• Manufacturer: NXP Semiconductors

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Philips Semiconductors
6
A versatile frequency generator section is provided (see
Fig.3). For normal operation, use a 3.58 MHz quartz
crystal or PXE resonator. The frequency generator
includes precision circuitry for dual tone multifrequency
(DTMF) signals, which is typically used for tone dialling
telephone sets.
6.1
Table 2 gives the derivative addresses, mnemonics and access types of the frequency generator derivative registers.
The addresses 03H to FFH are not used.
Table 2 Addresses of the frequency generator derivative registers
Notes
1. HGF = High Group Frequency; access type W.
2. LGF = Low Group Frequency; access type W.
1998 May 11
ADDRESS
8-bit microcontroller with DTMF generator
FREQUENCY GENERATOR
01H
02H
Frequency generator derivative registers
REGISTER
8 internal bus
HGF
LGF
8
8
(2)
(1)
REGISTER
REGISTER
HGF
LGF
Fig.3 Block diagram of the frequency generator section.
H7
L7
7
SYNTHESIZER
SYNTHESIZER
REFERENCE
CAPACITOR
SWITCHED-
SINE WAVE
SINE WAVE
BANDGAP
VOLTAGE
DIGITAL
DIGITAL
H6
L6
6
H5
L5
5
6
DAC
DAC
The TONE output can alternatively issue twelve modem
frequencies for data rates between 300 and 1200 bits/s.
In addition to DTMF and modem frequencies, two octaves
of musical scale in steps of semitones are available.
H4
L4
4
LOW-PASS FILTER
CAPACITOR
SWITCHED-
H3
L3
3
RC LOW-PASS
H2
L2
2
FILTER
MBG099
Product specification
PCD3349A
H1
L1
1
TONE
H0
L0
0