34
7.4. Hardware Specifications
Table 7.2
Block Item Specification Remark
Device SH7020 By HITACHI
No. of bits 32 bits RISC
Gate
Array
Operating frequency 18.432 MHz Built-in
MASKROM is
not used.
Device SRM2B256SLMX-70 2 pcs (16-bit)
Capacity 32 Kbytes
SRAM
Access time 70 nsec.
Device M27C1024-10L1 Erasable with
ultra-violet light
Capacity 128 Kbytes
Memory
EEPRO
M
(MASK
ROM)
Access time 100 nsec.
Use the IC
socket to update
the firmware.
Protocol Original Ir Interface (IrDA device)
Conforms toVer. 1.2
By contact
method only.
Synchronization Start/Stop bit
Method Half duplex
Data bit : 8
Stop bit : 1
Data format
Parity bit : none
Fixed
Baud rate (bps) 9600, 38.4K, 115.2 K Bit switch/setting
of IrCOMM
Mark : LED off I/F level
Space: LED on (pulse width 1.6 usec. approx.)
On-pulse width
is fixed
irrespective of
the ransmission
rate.
I/F to
DT-930
Usage Connecting DT-930
Protocol RS-232C
Synchronization Start/Stop bit
Method Full duplex/Half duplex
Data length : 8 bits
Stop bit : 1
Data format
Parity bit : none
Bit switch/setting
of IrCOMM
Baud rate (bps) 2400, 4800, 9600, 19.2K, 38.4K, 57.6K, 115.2K
Mark -15 to –5V SD
Space +15 to 5 V
Mark -3 V or less
I/F level
RD
Space +3 V or more
DSUB 9 pin (male)
Pin no. 1 CD Pin no. 2 RD
Pin no. 3 SD Pin no. 4 ER
Pin no. 5 SG Pin no. 6 D
Pin no. 7 RS Pin no. 8 CS
Connector
(example)
Pin no. 9 CI
D-sub 9-pin
(male)
connector
I/F
I/F to
Host PC
Usage (example) PC, Modem, Printer
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