IA186ER/IA188ER
Data Sheet
16-Bit/8-Bit Microcontrollers with RAM
February 25, 2013
Table 43. PIO Pin Assignments (Continued)
PIO Number Associated Pin Name Power-On Reset Status
24
25
mcs2_n
Input with pull-up
Input with pull-up
Input with pull-up
Input with pull-up
Input with pull-up
Input with pull-up
Input with pull-up
Input with pull-up
mcs3_n/rfsh_n
uzi/clksel2_n
txd/pio27
rxd/pio28
s6/clksel1_n
int4
c,d
26
27
28
c,d
29
30
31
int2
a
When used as a PIO pin, it is an input with a pull-up option available.
b
When used as a PIO pin, it is an input with a pull-down option available.
c
Emulators use these pins and also a15–a0, ad15–ad0 (IA186ER), ale, bhe_n (IA186ER), clkouta, nmi, res_n,
and s2_n–s0_n.
d
If bhe_n/aden_n (IA186ER) or rfsh2_n/aden (IA188ER) is held low during POR, these pins revert to normal
operation.
The value of the PDATA registers is undefined at reset (see Tables 44 and 45).
Table 44. PDATA 0
15 14 13 12 11 10
9
8
7
6
5
5
4
4
3
3
2
2
1
1
0
0
PDATA15–PDATA0
Table 45. PDATA 1
15 14 13 12 11 10
9
8
7
6
PDATA31–PDATA16
Bits [15–0]—PDATA15–PDATA0 PIO Data 0 Bits → This register contains the values of
the bits that are either driven on, or received from, the corresponding PIO pins.
Depending on its configuration, each pin is either an output or an input. The values of
these bits correspond to those in the PIO Direction registers and PIO Mode registers.
Bits [15–0]—PDATA31–PDATA16 PIO Data 1 Bits → This register contains the values
of the bits that are either driven on, or received from, the corresponding PIO pins.
Depending on its configuration, each pin is either an output or an input. The values of
these bits correspond to those in the PIO direction registers and PIO Mode registers
The PIO pins may be operated as open-drain outputs by:
– Maintaining the data constant in the appropriate bit of the PIO data register.
– Writing the value of the data bit into the respective bit position of the PIO Direction
register, so that the output is either 0 or disabled depending on the value of the data
bit.
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