Jameco Electronics 3000 ユーザーズマニュアル
User’s Manual
67
The alternate output functions identified in Table 5-2 are configured by setting the appro-
priate bits in the Paralle Port x Function Register.
priate bits in the Paralle Port x Function Register.
Table 5-3. Parallel Port x Alternate Functions
Parallel Port x Function Register
(PCFR)
(Address = 0x0055)
(PDFR)
(Address = 0x0065)
(PEFR)
(Address = 0x0075)
(PFFR)
(Address = 0x003D)
(PGFR)
(Address = 0x004D)
Bit(s)
Value
Description
7:0
0
The corresponding port bit functions normally.
1
The corresponding port bit carries its alternate signal as an output. See Table 5-4
below. Only the bits that have alternate functions listed in Table 5-4 actually have
a control bit in these registers. That is, there are four in Port C, four in Port D,
eight in Port E, four in Port F, and eight in Port G.
below. Only the bits that have alternate functions listed in Table 5-4 actually have
a control bit in these registers. That is, there are four in Port C, four in Port D,
eight in Port E, four in Port F, and eight in Port G.
Table 5-4. Parallel Port x Alternate Functions Control Bits
Alternate Output Function
Bit
Port B
Port C
Port D
Port E
Port F
Port G
7
/SLAVEATTN, IA5
APWM3
I7
PWM3
APWM1
6
IA4
TXA
ATXA
I6
PWM2
TXE
5
IA3
APWM2
I5
PWM1
RCLKE
4
IA2
TXB
ATXB
I4
PWM0
TCLKE
3
IA1
I3
APWM0
2
IA0
TXC
I2
TXF
1
CLKA
I1
CLKC
RCLKF
0
CLKB
TXD
I0
CLKD
TCLKF