Sharp FO-4500, Service Manual

Page: 93 / 192

HD6477021X20 (IC12) Terminal descriptions
Classification Code
Terminal No.
(TFP-100B)
I/O Name Function
Bus control WAIT 54 I Wait It is input to insert Tw into the bus cycle during access to the
external space.
RAS 52 O Low address strobe Timing signal of low address strobe of DRAM
CASH 47 O High-order column
address strobe Timing signal of column address strobe of DRAM
It is output for access to high-order 8 bits of data.
CASL 49 O Low-order column
address strobe Timing signal of column address strobe of DRAM
It is output for access to low-order 8 bits of data.
RD 57 O Read It indicates that outside is read out.
WRH 56 O High-order write It indicates writing at the external high-order 8 bits.
WRL 55 O Low-order write It indicates writing at the external low-order 8 bits.
CS0~CS7 46~49,
51~54
O Chip select 0 thru 7 Chip select signal for external memory or device
AH 61 O Address hold Address hold timing signal for device which uses multiplex bus of
address/data
HBS,
LBS 20
56 O Low-/high-order byte
strobe Strobe signal of high/low byte
(Commonly used with AO, WRH.)
WR 55 O Write Output during writing. (Commonly used with WRL.)
DMAC DREQ0,
DREQ1 66,68 I DMA transfer request
(Channels 0 and 1) Input terminal of DMA transfer request from external
DACK0,
DACK1 65,67 O DMA transfer request
receiving (Channels
0 and 1) It indicates that DMA transfer request is received.
16-bit
integrated
timer pulse unit
(ITU) TIOCA0,
TIOCB0 51,
53
I/O ITU input
capture/output
conveyor (Channel 0) Output terminal of input capture input/output conveyor
TIOCA1,
TIOCB1 62,
64
I/O ITU input
capture/output
conveyor (Channel 1) Output terminal of input capture input/output conveyor
TIOCA2,
TIOCB2 83,
84
I/O ITU input
capture/output
conveyor (Channel 2) Output terminal of input capture input/output conveyor
TIOCA3,
TIOCB3 85,
86
I/O ITU input
capture/output
conveyor (Channel 3) Output terminal of input capture input/output conveyor
TIOCA4,
TIOCB4 87,
89
I/O ITU input
capture/output
conveyor (Channel 4) Output terminal of input capture input/output conveyor
TOCXA4,
TOCXB4 90,
91
O ITU output conveyor
(Channel 4) Output terminal of output conveyor
TCLKA~
TCLKD 65,66,90,
91 I ITU timer clock input External clock input terminal to counter of ITU
Timing pattern
controller (TPC) TP15~
TP0 100~93,
91~89,
87~83
O Timing pattern
Output 15 thru 0 Output terminal of timing pattern
Serial
communication
interface (SCI) TxD0,
TxD1 94,
96
O Sending data
(Channels 0 and 1 Sending data output terminal of SCI0, 1
RxD0,
RxD1 93,
95
I Receiving data
(Channels 0 and 1) Receiving data input terminal of SCI0, 1
SCK0,
SCK1 97,
98
I/O Serial clock
(Channels 0 and 1) Clock input/output terminal of SCI0, 1
I/O port PA15~
PA0 68~64,
62~60,
58~51
I/O Port A Input/output terminal of 16 bits
Input/output can be assigned for each bit.
PB15~
PB0 100~93,
91~89,
87~83
I/O Port B Input/output terminal of 16 bits
Input/output can be assigned for each bit.
FO-4500H
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