UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 549

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

20.3.4 Interrupt Mode Control Register (IMC)
the lowest priority level (level 3) is specified.
The IMC contains the PRSL flag. The PRSL flag specifies enabling/disabling of nesting of maskable interrupts for which
When the IMC is manipulated, the interrupt disabled state (DI state) should be set first to prevent misoperation.
The IMC can be read or written to with an 8-bit manipulation instruction or bit manipulation instruction.
RESET input sets the IMC register to 80H.
IMC
PRSL
7
6
0
Figure 20-4 Interrupt Mode Control Register (IMC) Format
5
0
4
0
CHAPTER 20 INTERRUPT FUNCTIONS
3
0
2
0
1
0
0
0
PRSL
0FFAAH
Address
0
1
Control of Nesting Operations for
Maskable Interrupts (Lowest Level)
Nesting between interrupts set as level 3
(lowest level) enabled
Nesting between interrupts set as level 3
(lowest level) disabled
On Reset
80H
R/W
R/W
509