
S1C88348/317/316/308 TECHNICAL HARDWARE
EPSON
I-43
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (System Controller and Bus Control)
The function of I/O terminals is set as shown in Table 5.2.1.2 in accordance with mode selection.
Table 5.2.1.2 I/O terminal settings
At initial reset, the bus mode is set as explained
below.
In MCU mode:
At initial reset, the S1C883xx is set in single chip
mode.
Accordingly, in MCU mode, even if a memory
has been externally expanded, the system is
activated by the program written to internal
ROM.
In systems with externally expanded memory,
perform the applicable bus mode settings
during the initialization routine originating in
internal ROM.
In MPU mode:
When the MPU mode is used, the expanded
mode (expanded 64K mode, expanded 512K
minimum mode or expanded 512K maximum
mode) set during initial reset must be pre-
selected by mask option.
You should set it to conform properly to system
configuration.
Terminal
R00
R01
R02
R03
R04
R05
R06
R07
R10
R11
R12
R13
R14
R15
R16
R17
R20
R21
R22
R23
R24
P00
P01
P02
P03
P04
P05
P06
P07
Output port R00
Output port R01
Output port R02
Output port R03
Output port R04
Output port R05
Output port R06
Output port R07
Bus mode
Expanded 64K mode
Expanded 512K mode
Single chip
Address bus A0
Address bus A1
Address bus A2
Address bus A3
Address bus A4
Address bus A5
Address bus A6
Address bus A7
Address bus A8
Address bus A9
Output port R10
Output port R11
Output port R12
Output port R13
Output port R14
Output port R15
Output port R16
Output port R17
Output port R23
Output port R24
I/O port P00
I/O port P01
I/O port P02
I/O port P03
I/O port P04
I/O port P05
I/O port P06
I/O port P07
Address bus A10
Address bus A11
Address bus A12
Address bus A13
Address bus A14
Address bus A15
RD signal
WR signal
Data bus D0
Data bus D1
Data bus D2
Data bus D3
Data bus D4
Data bus D5
Data bus D6
Data bus D7
Output port R20
Output port R21
Output port R22
Address bus A16
Address bus A17
Address bus A18