Texas Instruments 99/4A - Page 84

R0 RI Ry.' DESTINATION CONTROL REGISTER
TABLE 17: REGISTER ADDRESS FIELD
n
()
Tone 1 -Frequency
 j «■)
1
Tone 1 attenuation
n
i
(j
Tone 2 -Frequency
C)
1 1
~i
ill
Ki
Ui r+
fD
J
C Ju i-t-
(J 0
1
(j
r?
Tone 3 -Frequency
1
q
i
Tone 3 attenuation
1 1
(j
Noise control
1 1
i
Noise attenuation
DATA FORMATS
The -formats
r equ .i red to
transfer data are shown below
UPDATE FREQUENCY (2 BYTE TRANSFER)
1 I REG ADDR I DATA I
  
  
: RO!R1 ‘ R2 ’ : F6!F7!F8'F9 I ! 0
BIT 0 FIRST BYTE BIT 7 BIT O SECOND BITE BIT 7
UPDATED NOISE SOURCE (SINGLE BYTE TRANSFER)
1 REG ADDR ’ J ! SHIFT
RO!R1'R2 ! FB ! X I NFO NF1
1 1 1
BIT 0
BIT 7
UPDATE ATTENUATOR (SINGLE BYTE TRANSFER)
1
REG ADDR ! DATA
1
1
RO'R1!R2 1 AO ‘ A1!A2'A3
BIT O
BIT 7
HARDWARE DESCRIPTION
POWER CONNECTIONS
Thee TMS 9919 uses a sigle 5 volt power supply
L501 is used to decouple the power line.
on pin lb, L500 and