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6.2.8 Port 6
Port 6 is an 8-bit input/output port with output latches. P60 to P67 pins can be set to either input mode or output
mode in 1-bit units with port mode register 6 (PM6).
This port has the following functions related to the pull-up resistor. These functions deffer depending on the upper
4 bits or the lower 4 bits of the port, and mask ROM versions or PROM versions.
Mask version
PROM version
PUO6: Bit 6 of the pull-up resistor option register
P60 to P63 pins can drive LEDs directly.
The alternate function of the P60 to P63 pins is control signal output in external memory expansion mode.
RESET input sets port 6 to input mode.
Tables 6-14 and 6-15 show the block diagrams of port 6.
Cautions 1. When external wait is not used in external memory expansion mode, P66 can be used as an
2. The value of low-level input leakage current at the P60 to P63 pins depends on the following
[Mask ROM version]
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[PROM version]
144
CHAPTER 6 PORT FUNCTIONS
Table 6-4. Pull-Up Resistors for Port 6
Upper 4 bits (P64 to P67 pins)
The on-chip pull-up resistor can be connected to
the P64 to P67 pins in 4-bit units with PU06.
input/output port.
conditions.
•
When the pull-up resistor is contained: always –3
•
When the pull-up resistor is not contained:
•
Within 3 clocks after a read is executed to Port 6 (P6) or Port mode register 6 (PM6)
(when no wait cycles are inserted): –200
•
In other cases: –3
•
Within 3 clocks after a read is executed to Port 6 (P6) or Port mode register 6 (PM6) (when
no wait cycles are inserted): –200
µ
•
In other cases: –3
A (max.)
The pull-up resistor can be connected bit-wise by mask
option.
The pull-up resistor is not contained.
µ
A (max.)
µ
A (max.)
µ
A (max.)
Lower 4 bits (P60 to P63 pins)
µ
A (max.)
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