Port 7 (P70 - P73) - Toshiba TLCS-90 Series Data Book

TOSHIBA TMP90C840
3.5.8 Port 7 (P70 - P73)
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Port 7 is a 4-bit general-purpose I/O port (P7: memory address FFCDH)
whose I/O function is specified by the control register (P67CR: bits 4
- 7 of memory address FFCEH). The control register is initialized to
"a" by resetting, whereby Port 7 turns to the input mode.
This port is also serviceable as a stepping motor control port channel
I (MIa - MI3), so either the general-purpose I/O or the stepping motor
control port can be selected by the control register (SMMOD: bits 4
and 5 of memory address FFCBH). It is served as the general-purpose
I/O port by resetting.
Reset
~ ____________ 4-__________ +--1IDirectionl~
________
~~
__
~
IControl
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writ! P67CR
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~IFunctionL-
I Control , -
t
Write SMMOD
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1' . . . . . . .
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Output I Port 7
Shift~
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Latch
I
(P70-P73
Output
/MIO-M13)
Buffer
~
,w SA7
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PI
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Shift Alternate
I-' t - - - - - I
o
I
Register
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