UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 98

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

96
(2) Pull-up resistor option registers (PU0, PU2, PU3, PU4, PU5, PU6)
Symbol
PU0
PU2
PU3
PU4
PU5
PU6
These registers set whether the internal pull-up resistor is connected to each port. By setting PU0 and PU2
to PU6, on-chip pull-up resistors corresponding to bits in PU0 and PU2 to PU6 can be used.
PU0, PU2 to PU6 are individually set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears these registers to 00H.
Cautions 1. Port 1 is not provided with an on-chip pull-up resistor.
PU37
PU47
PU57 PU56 PU55 PU54
PU67 PU66 PU65 PU64
7
0
0
2. When PUm is set to 1, an on-chip pull-up resistor is connected regardless of whether
PU26 PU25 PU24
PU36 PU35 PU34
PU46 PU45 PU44
6
0
the mode is input/output mode or external expansion mode. Accordingly, when using
the port in output or external expansion mode, set the corresponding bit of PUm to 0 (m
= 0, 2 to 6).
Figure 4-11. Format of Pull-up Resistor Option Register
5
0
4
0
PU03
PU23
PU33
PU43
PU53
0
3
CHAPTER 4 PORT FUNCTIONS
User’s Manual U13029EJ7V1UD
PU02 PU01 PU00
PU22 PU21 PU20
PU32 PU31 PU30
PU42 PU41 PU40
PU52 PU51 PU50
2
0
1
0
0
0
PUmn
0
1
Address
FF30H
FF32H
FF33H
FF34H
FF35H
FF36H
Selects internal pull-up resistor of Pmn pin
(m = 0: n = 0 to 3)
(m = 2: n = 0 to 6)
(m = 3, 4, 5: n = 0 to 7)
(m = 6: n = 4 to 7)
On-chip pull-up resistor is not used
On-chip pull-up resistor is used
After reset
00H
00H
00H
00H
00H
00H
R/W
R/W
R/W
R/W
R/W
R/W
R/W