M30800SFP-BL#U5 Renesas Electronics America, M30800SFP-BL#U5 Datasheet - Page 81

• Manufacturer Part Number: M30800SFP-BL#U5
• Description: MCU 3/5V 0K,PB-FREE 100-QFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/80r

Specifications of M30800SFP-BL#U5

• Core Processor: M16C/80
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SIO, UART/USART
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 45
• Program Memory Type: ROMless
• Ram Size: 10K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 10x10b, D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

M
R
R
e
E
1
v
J
Table 9.7 Relationship between Interrupts without Interrupt Priority Levels and IPL
6
Figure 9.6 Stack status before and after an interrupt request is acknowledged
1 .
0
C
9.14 Saving Registers
9
0 .
Interrupt sources without interrupt priority levels
Watchdog timer, NMI
Reset
Other
8 /
Stack status before interrupt request is acknowledged
B
When an interrupt request is acknowledged, the interrupt priority level of the acknowledged interrupt is
set to the processor interrupt priority level (IPL).
If an interrupt request is acknowledged that does not have an interrupt priority level, the value shown in
Table 9.7 is set to the IPL.
In an interrupt sequence, only the contents of the flag register (FLG) and program counter (PC) are
saved to the stack area.
The order in which these contents are saved is as follows: First, the FLG register is saved to the stack
area. Next, the 16 high-order bits and 16 low-order bits of the program counter expanded to 32-bit are
saved. Figure 9.6 shows the stack status before an interrupt request is acknowledged and the stack
status after an interrupt request is acknowledged.
In a high-speed interrupt sequence, the contents of the flag register (FLG) is saved to the flag save
register (SVF) and program counter (PC) is saved to PC save register (SVP).
If there are any other registers you want to be saved, save them in software at the beginning of the
interrupt routine. The PUSHM instruction allows you to save all registers except the stack pointer (SP)
by a single instruction.
The execution speed is improved when register bank 1 is used with high speed interrupt register selected
by not saving registers to the stack but to the switching register bank. In this case, switch register bank
mode for high-speed interrupt routine.
0
9.13 Changes of IPL When Interrupt Request Acknowledged
0
0
Address
1
A
8
G
u
7
o r
m-6
m-5
m–4
m–3
m–2
m–1
m
m+1
. g
0 -
u
1
0
p
0
, 2
MSB
0
2
0
0
Content of
previous stack
Content of
previous stack
5
Stack area
Page 68
_______
f o
3
2
LSB
9
[SP]
Stack pointer
value before
interrupt occurs
Stack status after interrupt request is acknowledged
Address
m-6
m-5
m–4
m–3
m–2
m–1
m
m+1
MSB
Value that is set to IPL
Content of
previous stack
Content of
previous stack
Program counter
Program counter
Program counter
Flag register
Flag register
Stack area
(FLG
Not changed
(PC
(FLG
(PC
(PC
0
M
L
H
L
)
)
)
H
)
0
)
7
0
9. Interrupt Outline
LSB
[SP]
New stack
pointer value