NEC uPD78P078 User Manual
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CHAPTER 22 INTERRUPT FUNCTIONS
(3) Priority specify flag registers (PR0L, PR0H, PR1L)
The priority specify flag is used to set the corresponding maskable interrupt priority orders.
PR0L, PR0H, and PR1L are set with a 1-bit or 8-bit memory manipulation instruction. If IF0L and IF0H are
used as a 16-bit register PR0, use a 16-bit memory manipulation instruction for the setting.
RESET input sets these registers to FFH.
Figure 22-4. Priority Specify Flag Register Format
Cautions 1. When a watchdog timer is used in the watchdog timer mode 1, set 1 in TMPR4 flag.
2. Set always 1 in PR1L bit 5 to bit 7.
<7>
PPR6
Symbol
PR0L
<6>
PPR5
<5>
PPR4
<4>
PPR3
<3>
PPR2
<2>
PPR1
<1>
PPR0
<0>
TMPR4
Address
FFE8H
FFH
After
Reset
R/W
R/W
0
1
Priority Level Selection
High priority level
Low priority level
<7>
TMPR01
PR0H
<6>
TMPR00
<5>
TMPR3
<4>
STPR
<3>
SRPR
<2>
SERPR
<1>
CSIPR1
<0>
CSIPR0
7
1
PR1L
6
1
5
1
<4>
TMPR6
<3>
TMPR5
<2>
ADPR
<1>
TMPR2
<0>
TMPR1
FFE9H
FFH
R/W
FFEAH
FFH
R/W
xxPRx