PCD3359A View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
PCD3359A Datasheet PDF : 32 Pages
| |||
Philips Semiconductors
8-bit microcontroller with DTMF
generator and 128 bytes EEPROM
Product specification
PCD3359A
6 FREQUENCY GENERATOR
A versatile frequency generator section is provided (see
Fig.4). 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.Their frequencies are provided in purely
sinusoidal form on the TONE output or as square waves
on the P1.7/MDY output.
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.
In case no tones are generated, or the melody function is
used, the TONE output is in 3-state mode.
6.1 Frequency generator derivative registers
6.1.1 HIGH AND LOW GROUP FREQUENCY REGISTERS
Table 3 gives the addresses, symbols and access types of the High Group Frequency (HGF) and Low Group Frequency
(LGF) Registers.
Table 3 Hexadecimal addresses, symbols, access types and bit symbols of the frequency registers
REGISTER REGISTER ACCESS
BIT SYMBOLS
ADDRESS SYMBOL
TYPE
7
6
5
4
3
2
1
0
11H
HGF
W
H7
H6
H5
H4
H3
H2
H1
H0
12H
LGF
W
L7
L6
L5
L4
L3
L2
L1
L0
6.1.2 MELODY AND PORT INTERRUPT CONTROL REGISTER (MDYCON)
The Melody and Port Interrupt Control Register has two functions: bit 0 defines the behaviour of the melody output; bits
4 to 7 individually enable/disable specific pairs of Port 0 interrupts. MDYCON is a R/W register.
Table 4 Melody and Port Interrupt Control Register (address 13H)
7
6
5
4
3
2
1
0
EPI3
EPI2
EPI1
EPI0
0
0
0
EMO
Table 5 Description of MDYCON bits
BIT
7 to 4
3 to 1
0
SYMBOL
DESCRIPTION
EPI3 to EPI0 Enable Port 0 interrupts. Bits 7 to 4 individually enable/disable specific pairs of Port 0
interrupts; see Table 6 and Section 8.2 for details.
−
These bits are set to a logic 0.
EMO
Enable Melody Output. If bit EMO = 0, then P1.7/MDY is a standard port line and the
TONE output is enabled. If bit EMO = 1, then P1.7/MDY is the melody output and the
TONE output is disabled (3-state). EMO = 1 does not inhibit the port instructions for
P1.7/MDY. Therefore, the state of both port line and flip-flop may be read in and the port
flip-flop may be written by port instructions. However, the port flip-flop of P1.7/MDY
must remain set to avoid conflicts between melody and port outputs. When the HGF
contents are zero while EMO = 1, P1.7/MDY is in the logic HIGH state.
1998 May 11
7
Share Link: 