HD49235FS Datasheet, PDF (6/41 Pages) Hitachi Semiconductor – Digital Signal Processor for CD

HD49235FS
Pin Description (cont)
Pin
Polarity
No. Symbol Name
I/O* Connection Function
H
L
71 TEST3 TEST 3
IU
72 UCKSL Microcomputer IU
clock selection
Open or V_DD
Test pin
Microprocessor clock
switching signal input
16.9344 8.4672
MHz MHz
73 V_DD (D) V_DD (digital)
—
74 PWM Pulse width TO
modulate
Digital power supply
Constant linear velocity (CLV)
control signal for disc motor
75 MON Motor on
O
Disc-motor-on status detection On
output
76 MSTOP Motor stop TO
CLV phase control signal
77 PW64 Pulse width O
64T
Microprocessor Brake release signal
78 ROTD Rotate
direction
O Microprocessor MSB of PWM pin output, for
monitoring
79 CLVS CLV status O Microprocessor Output indicating normal or Normal Starting
starting mode of CLV control
80 SLOCK Sync lock
O Microprocessor Disc motor rotation lock signal Lock
Note: * I—input; O—output; IO—input/output; IU—pulled-up input; TO—three-state output; A—analog pin;
AI—analog input; AO—analog output; XI—oscillator input; XO—oscillator output
Rev.2, Aug. 1995, page 6 of 41