Sharp FO-6700 Service Manual download pdf (Page 73)

FO-6700U

FO-67DL

5 – 17

(Continuing)

Classification Code

Terminal No.

I/O Name Function

(TFP-100B)

Power Vcc 13, 38, 63, I Power Connect to the power supply.

73, 80, 88 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, I Ground Connect to the ground.

41,50,59,70, Connect Vcc terminals to the power units of all systems.

81,82, 92 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 It is overflow output signal from WDT.

overflow

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 It indicates that the bus right is released to the external device.

acknowledge When receiving BACK signal, the device which outputs BREQ

signal can know that bus right is obtained.

Operation MD2~ 79~77 I Mode setting The terminal determines the operation mode.

mode control MD0 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~ 65,66,67,68, I Interrupt request 0 This is the interrupt request terminal which can be masked.

IRQ7 97,98,99,100 thru 7 Either level input or edge input can be selected.

IRQOUT 61 O Interrupt request It indicates that a factor of interrupt occurs.

output in the slave It indicates that interrupt occurs in the bus release mode.

mode

Address A21~A0 45~42,40,39, O Address Address is output.

37~33,31~25,

23~20

Data bus AD15~ 19~16,14, I/O Data bus Bidirectional data bus of 16 bits

AD0 12~5,3~1 Multiplex is possible with the low-order 16 bits of the address.

DPH 64 I/O High-order side data Parity data corresponds to D15 thru D8.

bus parity

DPL 62 I/O Low-order side data Parity data corresponds to D7 thru D0.

bus parity

Relationship between MD2 thru MD0 and operation modes

MD2 MD1 MD0 Operation mode Integrated ROM Bus width of area 0

000

Invalid

8-bit size

0 0 1 MCU mode 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) — —

HD6437021 (IC15) Terminal descriptions

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 191 192

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Sharp FO-6700 Service Manual Page 73

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