Toshiba TLCS-900/L1 Series Manual page 57

Note about bus release and programmable pull-up I/O port pins
When the bus is released (e.g., when
A23, and the control signals (
) are off and are set to high impedance.
2E
However, the output of built-in programmable pull-up resistors are kept before the bus is
released. These programmable pull-up resistors can be selected ON/OFF by programmable
when they are used as the input ports.
When they are used as output ports, they cannot be turned ON/OFF in software.
Table 3.5.4 shows the pin states after the bus has been released.
Table 3.5.4 Pin States (after bus release)
Pin Name
D0 to D7
D8 to D15 (P10 to P17)
A0 to A15
A16 to 23 (P20 to P27)
RD
WR
PZ2 ( ),
HWR
PZ3 (R/ ),
W
P60 ( ), P61 ( ),
CS0 CS1
P62 ( , ),
CS2 CS2A
P63 ( ),
CS3
= 0), the output buffers for D0 to D15, A0 to
BUSAK
, , ,
RD WR HWR R
The Pin State (when the bus is released)
Port Mode
The state is not changed.
(Do not become to high impedance
(High-Z).)
The state is not changed.
(Do not become to high impedance
(High-Z).)
The state is not changed.
(Do not become to high impedance
(High-Z).)
91C824-55
and to , EA24, EA25,
/ W CS 0 CS 3
Function Mode
Become high impedance (High-Z).
First sets all bits to high, then sets them to
high impedance (High-Z).
First sets all bits to high, then the output
buffer is OFF. The programmable pull-up
resistor is ON irrespective of the output
latch.
First sets all bits to high, then sets them to
high impedance (High-Z).
TMP91C824
to
CS2A
2008-02-20