Marantz Duetto SR110, Service Manual

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29
RESET
SCK
SDAT A
XIN ,
XOUT
P1, P0
Vcc1
Vcc2
Vss
Vp
Symbol
Pin name
Comment
Reset input
CS
Chip select
input
When "L", M66005 is initialized.
When "L", communication with the MCU is possible.
When "H", any instruction from the MCU is neglected.
Shift clock input
Serial input data is taken and shifted by the positive edge of SCK.
Serial data input
Clock input
Clock output
When use as a CR oscillator, connect external resistor and
capacitor.
When use an external clock, input external clock to XIN, and
XOUT must be opened.
DIG00~
DIG15
Digit output
Connect to digit (grid) pins of VFD.
Connect to segment (anode) pins of VFD. Pins from SEG00 to
SEG39 correspond to segment pins of VFD as shown in the table
below. SEG36~SEG39 pins are common to DIG12~DIG15 pins.
So, when use SEG36~SEG39, the number of digit to be used is
decreased.
Segment output
Universal port
Generally, use this port as the static output port.
This port also operates as the timing IN/OUT port to control
another M66005.
Positive power supply for internal logic.
Positive power supply for DIG and SEG outputs.
GND (0V)
Negative power supply to pull down.
SEG00~
SEG39
P1 : bidirectional
P0 : output
PIN DESCRIPTIONS