upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 350

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

(3) Control registers
350
After reset:
PU0
(a) Port 0 mode register (PM0)
After reset:
PM0
(b) Pull-up resistor option register 0 (PU0)
PM0 can be read/written in 1-bit or 8-bit units.
PU0 can be read/written in 1-bit or 8-bit units.
Cautions 1. If the input pulse width is 2 to 3 clocks, whether it will be detected as a valid edge or
00H
FFH
PU07
PM0n
PU0n
PM07
7
0
1
0
1
7
2. To ensure correct detection of pulses as valid edges, constant-level input is required
3. If noise is occurring in synchronization with the sampling clock, noise cannot be
4. Noise elimination is not performed when these pins are used as an normal input port
eliminated as noise is undefined.
for 3 clocks or more.
eliminated. In such cases, attach a filter to the input pins to eliminate the noise.
pins.
R/W
R/W
Output mode
Input mode
Do not connect
Connect
PU06
PM06
6
6
PU05
CHAPTER 14 PORT FUNCTION
PM05
5
Control of On-Chip Pull-Up Resistor Connection (n = 0 to 7)
5
User’s Manual U12768EJ4V1UD
Address: FFFFF080H
Address: FFFFF020H
PU04
PM04
Control of I/O Mode (n = 0 to 7)
4
4
PU03
PM03
3
3
PU02
PM02
2
2
PU01
PM01
1
1
PM00
PU00
0
0