m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 111

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

TIMER A
7.2 Block description
Fig. 7.2.5 Structure of timer Ai interrupt control register
7-8
7.2.5 Timer Ai interrupt control register
Figure 7.2.5 shows the structure of the timer Ai interrupt control register. For details about interrupts, refer
to “CHAPTER 6. INTERRUPTS.”
(1) Interrupt priority level select bits (bits 2 to 0)
(2) Interrupt request bit (bit 3)
Timer Ai interrupt control register (i = 0 to 4) (Addresses 75
Note: When writing to this bit, use the MOVM (MOVMB) instruction or STA (STAB, STAD) instruction.
select the priority level from levels 1 through 7. When a timer Ai interrupt request occurs, its priority
level is compared with the processor interrupt priority level (IPL), so that the requested interrupt is
enabled only when its priority level is higher than the IPL. (However, this applies when the interrupt
disable flag (I) = “0.”) To disable timer Ai interrupts, set these bits to “000
when the timer Ai interrupt request is accepted. This bit can be set to “1” or cleared to “0” by
software.
These bits are used to select a timer Ai interrupt’s priority level. When using timer Ai interrupts,
This bit is set to “1” when a timer Ai interrupt request occurs. This bit is automatically cleared to “0”
7 to 4
Bit
0
1
2
3
Interrupt priority level select bits
Interrupt request bit
Nothing is assigned.
Bit name
(i = 5 to 9) (Addresses F5
7905 Group User’s Manual Rev.1.0
b2 b1 b0
0 0 0 : Level 0 (Interrupt disabled)
0 0 1 : Level 1
0 1 0 : Level 2
0 1 1 : Level 3
1 0 0 : Level 4
1 0 1 : Level 5
1 1 0 : Level 6
1 1 1 : Level 7
0 : No interrupt requested
1 : Interrupt requested
16
16
Function
to 79
to F9
16
16
)
)
b7 b6 b5 b4 b3 b2 b1 b0
2
” (level 0).
Undefined
At reset
0
0
0
0
(Note)
R/W
RW
RW
RW
RW
—