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参数资料
| 型号： | MC68HC08AS20VFNR2 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, MICROCONTROLLER, PQCC52 |
| 封装： | PLASTIC, LCC-52 |
| 文件页数： | 53/96页 |
| 文件大小： | 3243K |
| 代理商： | MC68HC08AS20VFNR2 |
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6
MC68HC05E0
MOTOROLA
6-5
PARALLEL INPUT/OUTPUT PORTS
Pins PD5, PD6 and PD7 have internal pull-up resistors connected to VDD.
Conguration of Port D is done via the Port D Mode Register ($0012).
If a bit is set in the mode register, the corresponding port bit is used only as an output irrespective
of the value in the data direction register (see Table 6-2).
Figure 6-3 shows the internal structure of Port D.
Table 6-1 Port D Alternate Functions
As bidirectional I/O
Alternate function
PD0
P02 — Bus frequency clock signal
PD1
R/W — Read/write signal (readwhen high, write when low)
PD2
CS2 — Chip select signal (active low) for external RAM
PD3
CS3 — Chip select signal (active low) for external I/O
PD4
LIR — Load instruction register (active low)
PD5
A13 — Address line
PD6
A14 — Address line
PD7
A15 — Address line
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Port D mode register
$0012
EA15
EA14
EA13
DM4
DM3
DM2
DM1
DM0
0000 0001
Table 6-2 Port D Mode Table
Bit
Value
Function
DM0
0
1
port function (bidirectional)
P02 signal as output signal
DM1
0
1
port function (bidirectional)
RIW signal as output signal
DM2
0
1
port function (bidirectional)
CS2 (external RAM) signal as output signal
DM3
0
1
port function (bidirectional)
CS3 (external I/O) signal as output signal
DM4
0
1
port function (bidirectional)
LIR signal as output signal
EA15
0
1
port function (bidirectional)
A15 signal as output signal
EA14
0
1
port function (bidirectional)
A14 signal as output signal
EA13
0
1
port function (bidirectional)
A 13 signal as output signal
57
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