DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 124

• Manufacturer Part Number: DF2211NP24V
• Description: H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
• Manufacturer: Renesas Technology / Hitachi Semiconductor

I/O
P1DDR
RAM0
To change pin 14 from an output pin to an input pin, the value of bit 4 in P1DDR must be changed
from 1 to 0 (H'F0 to H'E0). Here the BCLR instruction will be used to clear bit 4 in P1DDR to 0.
I/O
P1DDR
RAM0
Since RAM0 is a read/write area of memory, performing the above bit manipulation using the
BCLR instruction causes only bit 4 in RAM0 to be cleared to 0. The value of RAM0 is then
written to P1DDR.
I/O
P1DDR
RAM0
By using the above procedure to access registers containing write-only bits, it is possible to create
programs that are not dependent on the type of instructions used.
Rev.7.00 Dec. 24, 2008 Page 70 of 698
REJ09B0074-0700
BCLR
MOV.B
MOV.B
#4,
@RAM0, R0L
R0L,
P17
Output
1
1
P17
Output
1
1
P17
Output
1
1
@RAM0
@P1DDR
P16
Output
1
1
P16
Output
1
1
P16
Output
1
1
P15
Output
1
1
P15
Output
1
1
P15
Output
1
1
P14
Output
1
1
P14
Output
1
0
P14
Input
0
0
P13
Input
0
0
P13
Input
0
0
P13
Input
0
0
P12
Input
0
0
P12
Input
0
0
P12
Input
0
0
P11
Input
0
0
P11
Input
0
0
P11
Input
0
0
P10
Input
0
0
P10
Input
0
0
P10
Input
0
0