BU24591 Datasheet, PDF (4/8 Pages) Rohm – 4bit 1chip micro-controller for CD-DA

Optical ICs
Pin No.
21, 39
Pin name
SIN0, SIN1
22, 40 SIO0, SIO1
23, 41
SCK0, SCK1
(SIO04B block)
52 to 59
ADC0 to ADC7
(ADC83A block)
1 to 4
5 to 8
9 to 12
13 to 16
17 to 20
SEG00 to 03
SEG04 to 07
SEG08 to 11
SEG12 to 15
SEG16 to 19
61 to 64
COM0 to COM3
(LCD07A block)
32
PWC
(PWC01A block)
33, 34
T0, T1
(TMR03B block)
49
OSC1
50
OSC2
(OSC03A block)
60
TEST
47
RESET
51
VDD
48
GND
BU24591
I/O
Function
I
• 8-bit serial data input.
I / O ^{• 8-bit serial data I/O.}
• I/O is switched by program.
Type
A
E
• Clock I/O for sending/receiving serial data.
I / O • Any of three type of internal clock and one external clock is
E
switched by program.
• Analog data input.
I
• Digital data input can be specified in a bit by program.
G
• Upon resetting, analog input is specified.
• LCD segment output or CMOS output can be switched in
O
4 ports by program.
F
• Upon resetting, CMOS output is specified and polarity is "L".
O
• LCD common output.
F
• Upon selecting 1/3 duty, COM3 outputs GND level.
I
• Pulse input.
A
• External count clock input.
I
• It can be used as 1-bit input.
A
I
• Oscillation circuit input.
H
• External clock input.
O • Oscillation circuit output.
H
• Test input. (This is a terminal for testing and it contains
I
the pull-down resistor. Use it in the open state usually.)
B
• Reset input.
I
(CPU is reset by setting this terminal to "L".)
A
− • Power supply
−
−
• Ground
−
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