HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 183

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

Pin Functions in Mode 4: In mode 4, (the expanded maximum mode in which the on-chip ROM
is used), software can select whether to use port 6 for general-purpose input, or for output of the
page address bits.
If a bit in P6DDR is set to “1,” the corresponding pin is used for page address output. If the bit is
cleared to “0,” the pin is used for input. A reset initializes these pins to the general-purpose input
function, so when the address bus is used, all necessary bits in P6DDR must first be set to “1.”
Figure 9-17 shows the pin functions in mode 4.
Pin Functions in Single-Chip Mode and Expanded Minimum Modes: In the single-chip mode
(mode 7) and expanded minimum modes (modes 1 and 2), each of the port 6 pins can be
designated as an input pin or an output pin, as indicated in figure 9-18, by setting the
corresponding bit in P6DDR to “1” for output or clearing it to “0” for input.
Port
Port
Figure 9-16 Port 6 Pin Functions in Mode 3
Figure 9-17 Port 6 Pin Functions in Mode 4
6
6
A
A
A
A
When P6DDR Bit
Is Set to “1”
A
A
A
A
19
18
17
16
19
18
17
16
(output)
(output)
(output)
(output)
(output)
(output)
(output)
(output)
166
When P6DDR Bit
is Cleared to “0”
P6
P6
P6
P6
3
2
1
0
(input)
(input)
(input)
(input)