Rev. 2.0, 11/00, page 283 of 1037
11.10
Port 8
11.10.1
Overview
Port 8 is an 8-bit I/O port. Table 11.26 shows the port 8 configuration.
Port 8 is a CMOS high-current I/O port. The sink current is 20 mA max. (V
OL
= 1.5 V) and up
to four pins can simultaneously be set on.
Port 8 consists of pins that are used both as high-current I/O ports (P87 to P80) and servo
monitor output (SV1, SV2), capstan external synchronous signal input (EXCAP), or external
trigger signal input (EXTTRG). It is switched by port mode register 8 (PMR8) and port control
register 8 (PCR8).
Table 11.26 Port 8 Configuration
Port
Function
Alternative Function
P87 (high-current I/O port)
None
P86 (high-current I/O port)
None
P85 (high-current I/O port)
None
P84 (high-current I/O port)
None
P83 (high-current I/O port)
SV2 (servo monitor output)
P82 (high-current I/O port)
SV1 (servo monitor output)
P81 (high-current I/O port)
EXCAP (capstan external synchronous signal input)
Port 8
P80 (high-current I/O port)
EXTTRG (external trigger signal input)
11.10.2
Register Configuration
Table 11.27 shows the port 8 register configuration.
Table 11.27 Port 8 Register Configuration
Name
Abbrev.
R/W
Size
Initial Value
Address
*
Port mode register 8
PMR8
R/W
Byte
H'F0
H'FFDF
Port control register 8
PCR8
W
Byte
H'00
H'FFD8
Port data register 8
PDR8
R/W
Byte
H'00
H'FFC8
Note:
*
The address indicates the low-order 16 bits.
Содержание Hitachi H8S/2191
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