z89138 ZiLOG Semiconductor, z89138 Datasheet - Page 48

• Manufacturer Part Number: z89138
• Description: Voice Processing Controllers
• Manufacturer: ZiLOG Semiconductor

Z89138/Z89139
Voice Processing Controllers
DSP Analog Data Registers
The D/A conversion is DSP driven by sending 10-bit data
to the EXT5 of the DSP. The six remaining bits of EXT5 are
not used (Figure 35).
48
F
F
E
E
D
D
C
C
Figure 35. EXT5 Register D/A Mode Definition
Figure 36. EXT5 Register A/D Mode Definition
B
B
A
A
9
9
8
8
P R E L I M I N A R Y
7
7
6
6
5
5
4
A/D supplies 8-bit data to the DSP through the register
EXT5 of the DSP. From the 16 bits of EXT5, only bits 2
through 9 are used by the A/D (Figure 36). Bits 0 and 1 are
padded with zeroes.
4
3
3
2
2
1
1
0
0
Reserved
8-Bit Data From A/D Converter
Reserved
(Read Only)
Reserved
10-Bit Data for D/A
Reserved
(Write Only)
DS97TAD0201
Zilog