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PCA3353CH Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCA3353CH Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 36 page 1999 Oct 28 8 Philips Semiconductors Product specification 8-bit microcontrollers with DTMF generator and 128 bytes EEPROM PCA3351C; 52C; 53C; PCD3351A; 52A; 53A 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 port line P1.7/MDY. 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. When no tones are generated the TONE output is in 3-state mode. 6.1 Frequency generator derivative registers 6.1.1 HIGH AND LOW GROUP FREQUENCY REGISTERS Table 4 gives the addresses, symbols and access types of the High Group Frequency (HGF) and Low Group Frequency (LGF) registers. Table 4 Hexadecimal addresses, symbols, access types and bit symbols of the frequency registers 6.1.2 MELODY CONTROL REGISTER (MDYCON) Table 5 Melody Control Register, MDYCON (address 13H; access type R/W) Table 6 Description of MDYCON bits REGISTER ADDRESS REGISTER SYMBOL ACCESS TYPE BIT SYMBOLS 7 6 5 4 3 2 1 0 11H HGF W H7H6H5H4H3H2H1H0 12H LGF W L7L6L5L4L3L2L1L0 7 6 5 4 3 2 1 0 0000000 EMO BIT SYMBOL DESCRIPTION 7to1 − These bits are set to a logic 0. 0 EMO Enable Melody Output. If bit EMO = 0, then P1.7/MDY is a standard port line. If bit EMO = 1, then P1.7/MDY is the melody output. 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 HIGH state. |
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