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16 Sound Generator (SNDA)
16.1 Overview
SNDA is a sound generator that generates melodies and buzzer signals. The features of the SNDA are listed below.
• Sound output mode is selectable from three types.
1. Normal buzzer mode (for normal buzzer output of which the output duration is controlled via software)
- Output frequency:
- Duty ratio:
2. One-shot buzzer mode (for short buzzer output such as a clicking sound)
- Output frequency:
- Duty ratio:
- One-shot output duration: Can be set within the range of 15.6 ms to 250 ms. (16 types)
3. Melody mode (for playing single note melody)
- Pitch:
- Duration:
- Tempo:
- Other:
• A piezoelectric buzzer can be driven with the inverted and non-inverted output pins.
• Can control the non-inverted output pin status while sound stops.
Figure 16.1.1 shows the SNDA configuration.
Clock generator
Interrupt
controller
S1C17W15 TECHNICAL MANUAL
(Rev. 1.3)
Can be set within the range of 512 Hz to 16,384 Hz.
Can be set within the range of 0 % to 100 %.
Can be set within the range of 512 Hz to 16,384 Hz.
Can be set within the range of 0 % to 100 %.
Can be set within the range of 128 Hz to 16,384 Hz.
(Scale: 3 octave from C3 to C6 with reference to A4 = 443 Hz)
Can be set within the range of half note/rest to thirty-second note/rest. (7 types)
Can be set within the range of 30 to 480. (16 types)
Tie can be specified (slur is not supported).
SNDA
CLK_SNDA
(SNDDAT register)
CLKSRC[1:0]
CLKDIV[2:0]
DBRUN
MODEN
Sound register
Sound generation
SINV
Output control circuit
SSTP
Interrupt control
EMIE
EDIE
Figure 16.1.1 SNDA Configuration
Seiko Epson Corporation
Sound buffer
SBSY
MOSEL[1:0]
STIM[3:0]
circuit
circuit
EMIF
EDIF
16 SOUND GENERATOR (SNDA)
BZOUT
#BZOUT
16-1
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