RC8660 VOICE SYNTHESIZER
RC SYSTEMS
Figure 1.7. Bus/printer interface
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R
TS
R
RDY
AF
AE
STBY
R
7
6
5
4
3
2
1
0
Status Register Bit
Description
SR.7 = RESERVED (R)
Reserved for future use. Mask when polling the Status Register.
SR.6 = TALK STATUS (TS)
1 = Talking
0 = Idle
The TS bit has the same meaning as the TS0 pin. “1” means that the RC8660 is producing output;
“0” means output has ceased. The TS bit is not affected by the TS Pin Control command, which
affects only the TS pins.
SR.5 = RESERVED (R)
Reserved for future use. Mask when polling the Status Register.
SR.4 = READY STATUS (RDY)
1 = Ready
0 = Busy
The RDY bit has the same meaning as the RDY# pin. The RC8660 sets RDY to “1” to indicate
that it is ready to receive data. RDY drops to “0” momentarily after each write operation over the
PIO bus, acknowledging receipt of each character.
SR.3 = ALMOST FULL (AF)
1 = Buffer almost full
0 = Buffer not almost full
This bit is “1” anytime there are less than 100 bytes available in the input buffer. AF is always “0”
in the real time audio playback mode and when using the musical tone generator.
SR.2 = ALMOST EMPTY (AE)
1 = Buffer almost empty
0 = Buffer not almost empty
This bit is “1” anytime there are less than 100 bytes remaining in the input buffer. AE is always “1”
in the real time audio playback mode and when using the musical tone generator.
SR.1 = STANDBY MODE (STBY)
1 = RC8660 is in Standby mode
0 = RC8660 not in Standby mode
This bit is “1” when the RC8660 has entered Standby mode. Standby mode is entered either by
setting the STBY# pin Low or by allowing the Sleep Timer to expire.
SR.0 = RESERVED (R)
Reserved for future use. Mask when polling the Status Register.
Table 1.5. Bus interface Status Register Bit Definitions