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III PERIPHERAL BLOCK: INPUT/OUTPUT PORTS
Input-Port Pins
The input pins concurrently serve as the input pins for peripheral circuits, as shown in Table 9.1. Whether they are
used as input ports or for peripheral circuits can be set bit-for-bit using a function select register. All pins not used for
peripheral circuits can be used as general-purpose input ports that have an interrupt function.
Pin name
I/O
K50/#DMAREQ0
I
Available Input port / High-speed DMA request 0
K51/#DMAREQ1
I
Available Input port / High-speed DMA request 1
K52/#ADTRG
I
Available Input port / AD converter trigger
K60/AD0
I
K61/AD1
I
K62/AD2
I
K63/AD3
I
At cold start, all pins are set for input ports Kxx (function select register CFKxx = "0"). When these pins are used for
the internal peripheral circuits, write "1" to CFKxx. For details on pin functions in this case, refer to the description
of each peripheral circuit in this manual.
At hot start, the pins retain their state from prior to the reset.
When the ports set for A/D converter input are read, the value obtained is always "0".
Notes on Use
The input buffers of the K60 to K63 ports use AV
Therefore, the following precautions must be taken.
1) When using K60–K63 as general-purpose input ports, the voltage input to the port must be high level = AV
low level = V
.
SS
2) When using V
as high level similar to other ports, V
DD
V
level is lower than the AV
DD
the AV
level, current flows from the V
DD
3) To fix the input level externally when the port is not used, the input pin should be connected to V
B-III-9-2
Table 9.1 Input Pins
Pull-up
Function
–
Input port / AD converter input 0
–
Input port / AD converter input 1
–
Input port / AD converter input 2
–
Input port / AD converter input 3
DD
level, current flows in the input buffer, or if the input V
DD
power supply to the AV
DD
CFK50(D0)/K5 function select register(0x402C0)
CFK51(D1)/K5 function select register(0x402C0)
CFK52(D2)/K5 function select register(0x402C0)
CFK60(D0)/K6 function select register(0x402C3)
CFK61(D1)/K6 function select register(0x402C3)
CFK62(D2)/K6 function select register(0x402C3)
CFK63(D3)/K6 function select register(0x402C3)
(power voltage for A/D converter) as their power source.
must be the same voltage level as AV
DD
power supply.
DD
EPSON
Function select bit
DD
. If the input
DD
level is higher than
DD
or AV
SS
S1C33210 FUNCTION PART
and
.
DD
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