Sharp FO-2970M Service Manual - Page 39

SH7041 IC5 Terminal descriptions

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FO-2970MU SH7041 (IC5) Terminal descriptions Classification Code Terminal No. I/O Name Power Vcc 12,26,40, I Power 63,77,85, 99,112,135 Function Connect Vcc terminals with the power source for all systems. If any open terminal remained, operation is impossible. Vss 6,14,28, I Ground 35,42,55, 61,71,79, 87,93,117, 129,141 Connect to the ground. Connect Vss terminals with the ground for all systems. If any open terminal remained, operation is impossible. Vpp I Program power source Connected with the power source (Vcc) for normal operation. In case of PROM mode, apply 12.5 V. Clock PLL Vcc 104 I PLL power Power source for the built-in PLL oscillator. PLL Vss 106 I PLL ground Ground for the built-in PLL oscillator. PLLCAP 105 I PLL capacity External capacity terminal for the built-in PLL oscillator. EXTAL 96 I External clock Connected with the crystal oscillator. By EXTAL terminal the external clock can be input. XTAL 94 I Crystal Connected with the crystal oscillator. CK 107 O System clock Supplied to peripheral devices. System control RES 108 I Power-on-reset When impressing low level onto this terminal, power-on-reset condition is attained. MRES 144 I Manual reset When applying low level to this terminal, manual reset condition is obtained. WDTOVF 44 O Watch dog timer overflow Overflow output signal from WDT. BREQ 33,38 I Bus right demand Low level obtained when external device demands to release the bus right. BACK 30,37 O Bus right demand Shows that the bus right has been released to the external device. acknowledge The device outputting signal BREQ can acknowledge the pass right gained by receiving signal BACK. Operation mode control Interrupt MD0~ MD3 NMI 95,97 102,103 98 I Mode setting I Non-maskable interrupt The terminal to determine operation modes. Do not change the input value during operation. Non-maskable interruption demand terminal. Receiving on either leading edge or trailing edge can be selected. IRQ0 ~ IRQ7 31,32,34 37~39 41,51,52 64~69 70,72 132,136 I Interruption demand Maskable interruption demand terminal. Level input and edge 0 to 7 input can be selected. IRQOUT 5,46 O Interruption demand Shows that the interrupt factor has occurred. output During bus release, interrupt occurred can be known. Address bus A0~A21 7~11,13, 15~24,25, 27,29,30, 37~39,41 O Address bus Outputs address. (Continuing) 5 - 3

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FO-2970MU
5 – 3
(Continuing)
Classification
Code
Terminal No.
I/O
Name
Function
Power
Vcc
12,26,40,
I
Power
Connect Vcc terminals with the power source for all systems.
63,77,85,
If any open terminal remained, operation is impossible.
99,112,135
Vss
6,14,28,
I
Ground
Connect to the ground.
35,42,55,
Connect Vss terminals with the ground for all systems.
61,71,79,
If any open terminal remained, operation is impossible.
87,93,117,
129,141
Vpp
I
Program power source
Connected with the power source (Vcc) for normal operation.
In case of PROM mode, apply 12.5 V.
Clock
PLL Vcc
104
I
PLL power
Power source for the built-in PLL oscillator.
PLL Vss
106
I
PLL ground
Ground for the built-in PLL oscillator.
PLLCAP
105
I
PLL capacity
External capacity terminal for the built-in PLL oscillator.
EXTAL
96
I
External clock
Connected with the crystal oscillator. By EXTAL terminal the external
clock can be input.
XTAL
94
I
Crystal
Connected with the crystal oscillator.
CK
107
O
System clock
Supplied to peripheral devices.
System control
RES
108
I
Power-on-reset
When impressing low level onto this terminal, power-on-reset
condition is attained.
MRES
144
I
Manual reset
When applying low level to this terminal, manual reset condition
is obtained.
WDTOVF
44
O
Watch dog timer
Overflow output signal from WDT.
overflow
BREQ
33,38
I
Bus right demand
Low level obtained when external device demands to release
the bus right.
BACK
30,37
O
Bus right demand
Shows that the bus right has been released to the external device.
acknowledge
The device outputting signal BREQ can acknowledge the pass
right gained by receiving signal BACK.
Operation
MD0~
95,97
I
Mode setting
The terminal to determine operation modes.
mode control
MD3
102,103
Do not change the input value during operation.
Interrupt
NMI
98
I
Non-maskable
Non-maskable interruption demand terminal. Receiving on either
interrupt
leading edge or trailing edge can be selected.
IRQ0 ~
31,32,34
I
Interruption demand
Maskable interruption demand terminal. Level input and edge
IRQ7
37~39
0 to 7
input can be selected.
41,51,52
64~69
70,72
132,
136
IRQOUT
5,46
O
Interruption demand
Shows that the interrupt factor has occurred.
output
During bus release, interrupt occurred can be known.
Address bus
A0~A21
7~11,13,
O
Address bus
Outputs address.
15~24,25,
27,29,30,
37~39,41
SH7041 (IC5) Terminal descriptions