TMP86PS64FG Datasheet, PDF (73/210 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

TMP86PS64FG
5.7 Port P6 (P67to P60)
Port P6 is an 8-bit input/output port, which can be configured individually as an input or an output under software
control. Port P6 is also used as an analog input. Input/output mode is specified by the corresponding bit in the port P6
input/output control register (P6CR), P6 output latch (P6DR) and ADCCR1<AINDS>. During reset, P6CR and
P6DR are initialized to “0” and ADCCR1<AINDS> is set to “1”. At the same time, the input data of P67 to P60 are
fixed to “0” level. When port P6 is used as input port, the corresponding bit in P6CR and P6DR should be set to input
mode (P6CR = “0”, P6DR = “1”). When used as output port, the corresponding bit in P6CR should be set to “1”.
When used as analog input port, the corresponding bit in P6CR and P6DR should be set to analog input mode (P6CR
= “0”, P6DR = “0”) and ADCCR1<AINDS> is set to “0”, then the AD conversion is started. Setting P6DR to “0” is
necessary to prevent generating the penetration electric current. So the output latch of the port used as analog input
should be set to “0” beforehand. Actually selection of the conversion input channels is specified by
ADCCR1<SAIN>.
Pins used for analog input can be used as I/O port. During AD conversion, output instructions should not be exe-
cuted to keep a precision. In addition, a variable signal should not be input to a port adjacent to the analog input dur-
ing AD conversion.
When the AD converter is in use (P6DR = “0”), bits mentioned above are read as “0” by executing input instruc-
tions.
VDD
P6PUi
Analog input
AINDS
SAIN
STOP
OUTEN
P6CRi
Data input
Data output
DQ
Output latch
Note 1: i = 7 to 0
Note 2: STOP: bit 7 in SYSCR1, OUTEN: bit 4 in SYSCR1
Note 3: SAIN: AD input channel select signal
Figure 5-8 Port P6
Pull-up resistor
(Typ. 80 kΩ)
P6i
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