IA186EB/IA188EB
Data Sheet
8-Bit/16-Bit Microcontrollers
July 10, 2011
Table 8. IA188EB Pin/Signal Descriptions (Continued)
Pin
Signal
pdtmr
Name
pdtmr
PLCC
36
LQFP
24
PQFP
67
Description
Power-down timer. Input/Output (push-pull).
Note: The IA188EB enters Powerdown Mode
when the PWRDN bit in the Power Control
Register is set to 1 and a HALT instruction is
executed. Exit from the Powerdown Mode
occurs upon receipt of a non-maskable interrupt
(i.e., assertion of the nmi input) or a reset (i.e.,
assertion of the resin_n input).
The pdtmr pin, which is normally connected to
an external capacitor, determines the amount of
time that the IA188EB waits before resuming
normal operation after an exit from the
Powerdown when a non-maskable interrupt is
received—essentially a delay between the
assertion of the nmi input and the enabling of
the IA188EB internal clocks. The delay
required depends on the start-up characteristics
of the crystal oscillator.
The pdtmr pin does not apply when the
Powerdown Mode is exited by the receipt of a
reset (i.e., the assertion resin_n).
rd_n
rd_n
4
73
6
36
49
read. Output. Active Low. When asserted
(low), rd_n indicates that the accessed memory
or I/O device must drive data from the location
being accessed onto the data bus.
ready. Input. Active High. When asserted
(high) the ready line indicates the completion of
a bus cycle. This signal must be active to
terminate any bus cycle unless the IA188EB
Chip-Select Unit is configured to ignore ready.
ready
ready
18
resin_n
resin_n
37
25
68
reset input. Input. Active Low. When resin_n
is asserted (low), the IA188EB immediately
terminates any bus cycle in progress and
assumes an initialized state. All pins are driven
to a known state, and resout (see next table
entry) is asserted.
resout
rfsh_n
resout
rfsh_n
38
7
26
76
69
39
reset output. Output. Active High. When
resout is asserted, it indicates that the IA188EB
is being reset. The resout signal will remain
active (high) as long as resin_n remains active
(low).
refresh. Output. Active Low. When rfsh_n is
asserted (low), it indicates that a refresh cycle is
in progress.
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