Sony UP-21MD Service Manual page 74

* Interface with mechanical control block on the VPR-74 board (FMY)
Bi-directional communication is performed by the asynchronous serial communication that uses serial
communication interface CH.3 incorporated into CPU.
Signal line name Vo Description
a AAS
SY_FMY_TXD Output Communication data
(SY-299 board, IC103: SY —> VPR-74 board, IC501: FMY)
FMY_SY_RXD Input Communication data
(VPR-74 board, IC501: FMY —> SY-299 board, IC 103: SY)
SY_FMY_RTS Output Communication enable
(SY-299 board, 1C103: SY + VPR-74 board, IC501: FMY) L:active
FMY_SY_CTS input Communication enable
(VPR-74 board, IC501: FMY -» SY-299 board, 10103: SY) L:active
Data length 8 bits
Stop bit 1 bit
Parity None
Baud rate 19200 bps
4-4-5. Analog Video Block (VA) Control on the VPR-74 Board
* PC bus control
Purpose
Controls the PC bus circuit on the analog board.
Signal tine name vo Description
lIC-SCL Output Serial data clock H:active
lIC_SDA Output Serial. data H:active
IC_CTS input Serial data transfer enable Hiactive
Functions obtained by PC bus control
(User menu)
HUE, COLOR, GAIN, OFFSET, MONI-R, MONI-G, MONI-B, IRE, SYNC ON G, and
INPUT SEL ,
(Service menu)
PICTURE, G DRIVE, B DRIVE, SUB-BRIGHT, and VBS Y
(Other functions)
HALFTONE