M-V850E-IA4 Renesas Electronics America, M-V850E-IA4 Datasheet - Page 90

• Manufacturer Part Number: M-V850E-IA4
• Description: KIT EVAL V850E IA4 UPD70F3186
• Manufacturer: Renesas Electronics America

Specifications of M-V850E-IA4

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

88
(7) Port settings
Caution To switch to external interrupt input (INTPn) from the port mode (by changing the
Remark
(when three or more alternate
Set the ports as follows.
functions are available)
functions are available)
(when two alternate
Alternate function 1
Alternate function 2
Alternate function 1
Alternate function 2
Alternate function 3
Alternate function 4
Alternate function
Alternate function
<1> Set the PFCn and PFCEn registers.
<2> Set the PMCn register.
<3> Set the INTRn/INTFn register (when external interrupt pin is set).
PMC0.PMC0n bit from 0 to 1), an external interrupt may be input if a wrong valid edge is
detected.
INTR0.INTR0n bit = 0), select external interrupt input (INTPn), and then specify the valid edge
(n = 0 to 7).
When switching to the port mode from external interrupt input (INTPn) (PMC0n bit = 1 → 0), an
edge may be detected. Be sure to disable edge detection (INTF0n bit = 0, INTR0n bit = 0), and
then select the port mode.
Switch to the alternate function using the following procedure.
If the PMCn register is set before setting the PFCn and PFCEn registers, an unexpected peripheral
function may be selected while the PFCn and PFCEn registers are being set.
Output mode
Input mode
Port mode
Therefore, be sure to disable edge detection (INTF0.INTF0n bit = 0 and
Figure 4-3. Register Settings and Pin Functions
(a)
(b)
(d)
(c)
"0"
"1"
"0"
"1"
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16543EJ4V0UD
PFCEn register
PFCn register
PFCn register
PMn register
"0"
"1"
(a)
(b)
(c)
(d)
PFCEnm
PMCn register
0
0
1
1
PFCnm
0
1
0
1