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H8/3003 数据表(PDF) 272 Page - Renesas Technology Corp

部件名 H8/3003
功能描述  microcontroller (MCU)
PDF  715 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8/3003 数据表(HTML) 272 Page - Renesas Technology Corp

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9.6 Port 8
9.6.1 Overview
Port 8 is a 5-bit input/output port that is also used for CS3 to CS0 output, RFSH output, and IRQ3
to IRQ0 input. Port 8 has the same set of pin functions in all operating modes. Figure 9-9 shows
the pin configuration of port 8.
Pins in port 8 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor pair. Pins P82 to P80 have Schmitt-trigger inputs.
Figure 9-9 Port 8 Pin Configuration
9.6.2 Register Descriptions
Table 9-9 summarizes the registers of port 8.
Table 9-9 Port 8 Registers
Address*
Name
Abbreviation
R/W
Initial Value
H'FFCD
Port 8 data direction register
P8DDR
W
H'F0
H'FFCF
Port 8 data register
P8DR
R/W
H'E0
Note: * Lower 16 bits of the address.
Port 8
P8 (input)/CS (output)
P8 (input)/CS (output)/IRQ (input)
P8 (input)/CS (output)/IRQ (input)
P8 (input)/CS (output)/IRQ (input)
P8 (input/output)/
4
3
2
1
0
0
1
2
3
Port 8 pins
RFSH (output)/IRQ (input)
0
3
2
1
254



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