TC9256, 57APG/AFG

2006-07-14

18

Note1:

Bit names in parentheses “(

)” apply to the TC9256APG and TC9256AFG.

Note2:

Bits marked with (*1) cannot be set on the TC9256APG and TC9256AFG.

Data is “0” for bits marked with (*2) on the TC9256APG and TC9256AFG.

Note3:

When pins I/O-5 to I/O-9 are used for output, the data in I5~I9 of the output register (D3H) is

undefined.

Note4:

When power is turned on, input register (D2H) I/O port control bits C5, C6 and M7 to M9 and

output data bits O5 to O9 are set to “0”.

(General-purpose I/O ports are set as input ports. Pins used both as general-purpose I/O ports

and general-purpose counter input are set for I/O port input. The output state of general-purpose

output ports is set to high impedance (N-channel open drain output

= off).

Note5:

On TC9256APG and TC9256AFG, pins I/O-5 and I/O-6 also serve as general-purpose counter

input pins. Therefore, bits IF1 and IF2 of input register 2 must be set to “0” when these pins are

used as I/O ports.

A typical example of data setting for general-purpose counter and I/O port use is shown below.

• TC9257APG and TC9257AFG

As shown above, the pins can be switched as required to enable use as an I/O port or general-purpose

counter.