Pin Functions - Hitachi H8S/2646 Hardware Manual

9.13.3

Pin Functions

Port F pins also function as LCD driver output pins (SEG20 to SEG17), external interrupt input
pins (IRQ2, IRQ3), the A/D trigger input pin (ADTRG), bus control signal I/O pins (AS, RD,
HWR, LWR, WAIT), and the system clock output pin (ø). Their functions differ in modes 4 to 6
and in mode 7. Table 9-29 lists the pin functions for port F.
Table 9-29 Port F Pin Functions
Pin Selection Method and Pin Functions
PF7/ø Switches as follows according to bit PF7DDR.
PF7DDR
Pin function
PF6/AS/SEG20 Switches as follows according to the operating mode and the setting of SGS3
(H8S/2646, to SGS0 and bit PF6DDR.
H8S/2646R,
H8S/2645)
PF6/AS/SEG36
(H8S/2648,
Operating Mode
H8S/2648R,
H8S/2647)
Setting of SGS3 to
SGS0
PF6DDR
Pin
function
284
PF7 input
Modes 4 to 6
SEG
output
—
H8S/2646, SEG20
H8S/2646R, output
H8S/2645
H8S/2648, SEG36
H8S/2648R, output
H8S/2647
0
Port SEG
output
— —
AS output
SEG20
output
SEG36
output
1
ø output
Mode 7
Port
0 1
PF6 input PF6 output