z90102 ZiLOG Semiconductor, z90102 Datasheet - Page 12

• Manufacturer Part Number: z90102
• Description: 40-pin Low-cost Digital Television Controller
• Manufacturer: ZiLOG Semiconductor

Z90102/90103/90104
40-Pin Low-Cost Digital Television Controller
FUNCTIONAL DESCRIPTION
The Z8 DTCincorporates special functions to enhance the
Z8’s versatility in consumer, industrial and television con-
trol applications.
Pulse Width Modulator (PWM). The has seven PWM
channels (Figure 9). There are three types of PWM cir-
cuits: PWM1 (one channel of 14-bit resolution) typically
used for Voltage Synthesis Tuning, PWM8-PWM6 (three
channels of 6-bit resolution) typically used for audio level
control, and PWM9, 10, 11 (three channels of 8-bit resolu-
tion) typically used for picture level control. The PWM con-
trol registers are mapped into external memory and are ac-
cessed through LDE and LDEI instructions.
12
/RESET
XTAL
AD7-0
AD7-0
AD7-0
FC12-3h
PWM1
PWM6
PWM9
FC1Bh
14-Bit
FC18h
6-Bit
8-Bit
FC1Ch
Reg
Reg
FC19h
Reg
FC1Ah
FC1Dh
Upper 7-Bit
Lower 7-Bit
5-0
7-0
Down Counter
14-Bit Binary
Figure 9. Pulse Width Modulator Block Diagram
13-0
13-7
13-7
6-0
5-0
5-0
7-0
7-0
6-0
Comparator
Comparator
Comparator
Distributor
Pulse
7-Bit
6-Bit
8-Bit
PWM1. It is a push-pull output.
PWMs 6 through 11. They have their maximum values
(on times) when all 1s are loaded in their PWM Value reg-
isters (and minimum value for all 0s). PWM1 has a maxi-
mum value for all 0s and minimum value for all 1s.
On-Screen Display (OSD). The OSD has a capability of
displaying 6 rows x 20 columns of 96 kinds of characters
for high resolution (11 x 15 dots) patterns (Figures 10 and
11).
RS & DFF
RSFF
RSFF
RSFF
RSFF
RSFF
RSFF
PWM Output
Port Reg
AD7-0
7-0
FC11h
0
MPX
PWM Mod Reg
7-0
AD7-0
FC10h
PWM10 (open-drain)
PWM9 (open-drain)
PWM11 (open-drain)
PWM1 push-pull
PWM6 (open-drain)
PWM7 (open-drain)
PWM8 (open-drain)
DS97TEL1902
output
Zilog