Casio MP-2000 Service Manual page 61

Name Number
IRTX2 25
IRRX2 26
FACF
UR21RQB 22
Miscellaneous
PWRGD 58
X1/CLK1 20
X2/CLK2 21
Vcc 15, 72
Vss 6, 47, 67, 95
Type Descriptions:
I Input TTL compatible
IS Input with Schmitt trigger
I/O20 Input/Output with 20 mA sink @ 0.4 V, source 8 mA
I/O24 Input/Output with 24 mA sink @ 0.4 V, source 8 mA
I/O36 Input/Output with 36 mA sink @ 0.4 V, source 8 mA
ICLK CLK input at 24 MHz
OCLK CLK output at 24 MHz
O4 Output with 4 mA sink @ 0.4 V, source 4 mA @ 2.4 V.
O16 Output with 16 mA sink @ 0.4 V, source 8 mA @ 2.4 V.
O20 Output with 14 mA sink @ 0.4 V, source 14 mA @ 2.4 v,
O24 Output with 24 mA sink @ 0.4 V, source 12 mA @ 2.4 V.
O36 Output with 36 mA sink @ 0.4 V, source 8 mA @ 2.4 V.
OD24 Open drain outputs, sinks 24 mA @ 0.4 V.
OD36 Open drain outputs, sinks 36 mA @ 0.4 V.
Type Description
O16 Alternate IR Transmit output.
O16 Alternate IR Receive input.
Floppy Disk Address Control. This signal is read and latched during reset
active.
I/O24 Serial Port Interrupt Request. Alternate IRQ output from UART2, refer to CR0
bit 5.
I Power Good. This input signal indicates that the power is valid. For device
operation, PWRGD must be active.
ICLK Clock 1. This external connection for a parallel resonant 24 MHz crystal. A
CMOS compatible oscillator is required if crystal is not used.
OCLK Clock 2. This is a 24 MHz crystal. If an external clock is used, this pin should
not be connected. This pin should not be used to drive an other drivers.
P Power. +5 Volt supply pin.
Ground pins.
— 60 —
@ 2.4 V
@ 2.4 V
@ 2.4 V