UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 561

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

must specify the start address of the interrupt service program to be executed when that interrupt is acknowledged next.
This interrupt service program start address must be in the base area.
The RETCS instruction is used to return from an interrupt that uses the context switching function. The RETCS instruction
Caution The RETCS instruction must be used to return from an interrupt processed by context switching.
Figure 20-12 Return from Interrupt that Uses Context Switching by Means of RETCS Instruction
PC
2 Restoration
4 Restoration
(To Original
Register Bank)
19-16
Subsequent interrupt acknowledgment will not be performed normally if a different instruction is used.
1 Restoration
PC
PSW
15-0
CHAPTER 20 INTERRUPT FUNCTIONS
W
V
U
T
Register Bank n (n = 0 to 7)
R5
R7
D
H
A
B
VP
UP
R4
R6
C
X
E
L
3 Transfer
RETCS Instruction Operand
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