RX610 Group
11. Buses
R01UH0032EJ0120 Rev.1.20
Page 259 of 1006
Feb 20, 2013
Table 11.5 shows the input/output pins of the external bus.
Table 11.5 Pin Configuration of the External Bus
Pin Name
I/O
Description
A23 to A0
*1
Output
Address output pins
BC0#
*1 *2
Output
A strobe signal; (the BC0# signal being at the low level) during access to an external
address space in single write strobe mode indicates that the lower-order byte (D7 to D0)
is valid.
When an 8-bit bus space is specified, this output pin is always held low regardless of
write access mode.
BC1#
*2
Output
A strobe signal; (the BC1# signal being at the low level) during access to an external
address space in single write strobe mode indicates that the higher-order byte (D15 to
D8) is valid.
This pin is not used when the 8-bit bus space is specified.
D15 to D0
I/O
Data input/output pins
D15 to D0 pins are enabled when the 16-bit bus space is specified, but D7 to D0 pins are
enabled when the 8-bit bus space is specified.
CS0#
Output
A strobe signal indicating that area 0 (CS0) is selected
CS1#
Output
A strobe signal indicating that area 1 (CS1) is selected
CS2#
Output
A strobe signal indicating that area 2 (CS2) is selected
CS3#
Output
A strobe signal indicating that area 3 (CS3) is selected
CS4#
Output
A strobe signal indicating that area 4 (CS4) is selected
CS5#
Output
A strobe signal indicating that area 5 (CS5) is selected
CS6#
Output
A strobe signal indicating that area 6 (CS6) is selected
CS7#
Output
A strobe signal indicating that area 7 (CS7) is selected
RD#
Output
A strobe signal indicating that reading from an external address space is in progress
WR0#
Output
A strobe signal; (the WR0# signal being at the low level) during writing to an external
address space in byte strobe mode indicates that the higher-order byte (D7 to D0) is
valid.
This strobe signal also indicates writing to an external address space is in progress in
single write strobe mode.
When an 8-bit bus space is specified, this output pin is held low during a write access
regardless of write access mode.
WR1#
Output
A strobe signal; (the WR1# signal being at the low level) during writing to an external
address space in byte strobe mode indicates that the higher-order byte (D15 to D8) is
valid.
The BC1# signal is output in single write strobe mode.
This pin is not used when the 8-bit bus space is specified.
WR#
Output
A strobe signal to indicate writing to an external address space in single write strobe
mode
WAIT#
Input
A wait request signal when accessing the external address space (Low: Wait request)
Note 1
.
The A0 and BC0# pin functions share the same pin, and either becomes effective according to the area, with the
function being A0 in byte-writing mode and BC0# in single write strobe mode.
In single write strobe mode,
setting 8-bit external bus width is prohibited. For information on other multiplexed pin functions, see section 14,
I/O Ports.
Note 2. The BC0# and BC1# signals are readable/writable signals.
Summary of Contents for RX600 Series
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