Sharp FO-4500, Руководство по обслуживанию

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HD6477021X20 (IC12) Terminal descriptions
Classification Code
Terminal No.
(TFP-100B)
I/O Name Function
Power Vcc 13, 38, 63,
73, 80, 88 I Power Connect to the power supply.
Connect Vcc terminals to the power units of all systems.
If any open terminal is present, it will not operate
Vss 4,15,24,32,
41,50,59,70,
81,82, 92 I Ground Connect to the ground.
Connect Vcc terminals to the power units of all systems.
If any open terminal is present, it will not operate.
Clock EXTAL 71 I External clock Connect to the quartz oscillator. Moreover, EXTAL terminal can
input the external clock.
Use the same frequency for the quartz oscillator, external clock
and system clock.
XTAL 72 I Crystal Connect the quartz oscillator. Connect the same frequency of the
system clock (CK).
To input external clock from EXTAL terminal, open EXTAL
terminal.
CK 69 O System clock Supply system clock to the peripheral device.
System control RES 76 I Reset If this terminal is turned to the low level when NMI is at the high
level, it will be brought into the power-on state. If this terminal is
turned to the low level when NMI is at the low level, it will be
brought into the manual.reset state.
WDTOVF 75 O Watch dog timer
overflow It is overflow output signal from WDT.
BREQ 60 I Bus right request Select the low level to make the external device request the
release of bus right.
BACK 58 O Bus right request
acknowledge It indicates that the bus right is released to the external device.
When receiving BACK signal, the device which outputs BREQ
signal can know that bus right is obtained.
Operation
mode control MD2~
MD0 79~77 I Mode setting The terminal determines the operation mode.
During operation, don’t vary any input value. The relationship
between MD2 thru MD0 and operation modes are shown in the
following list.
Interrupt NMI 74 I No-maskable interrupt This is the interrupt request terminal which can not be masked.
Either leading edge or trailing edge is selected for receiving.
IRQ0~
IRQ7
65,66,67,68,
97,98,99,100
I Interrupt request 0
thru 7 This is the interrupt request terminal which can be masked.
Either level input or edge input can be selected.
IRQOUT 61 O Interrupt request
output in the slave
mode It indicates that a factor of interrupt occurs.
It indicates that interrupt occurs in the bus release mode.
Address A21~A0 45~42,40,39,
37~33,31~25,
23~20 O Address Address is output.
Data bus AD15~
AD0 19~16,14,
12~5,3~1
I/O Data bus Bidirectional data bus of 16 bits
Multiplex is possible with the low-order 16 bits of the address.
DPH 64 I/O High-order side data
bus parity Parity data corresponds to D15 thru D8.
DPL 62 I/O Low-order side data
bus parity Parity data corresponds to D7 thru D0.
(Continuing)
Relationship between MD2 thru MD0 and operation modes
MD2 MD1 MD0 Operation mode IntegratedROM Bus width of area 0
0 0 0
MCU mode
Invalid
8-bit size
0 0 1 16-bit size
0 1 0 Valid —
0 1 1 (Reserved) — —
1 0 0 (Reserved) — —
1 0 1 (Reserved) — —
1 1 0 (Reserved) — —
1 1 1 (Reserved) — —
FO-4500H
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