M306N5FCTFP Renesas Electronics America, M306N5FCTFP Datasheet - Page 271

• Manufacturer Part Number: M306N5FCTFP
• Description: IC M16C MCU FLASH 100QFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/6Nr

Specifications of M306N5FCTFP

• Core Processor: M16C/60
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, I²C, IEBus, SIO, UART/USART
• Peripherals: DMA, WDT
• Number Of I /o: 87
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 26x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Chapter 5
5.2.4 Rewrite the Interrupt Control Register
(1) The interrupt control register for any interrupt should be modified in places where no requests for that
(2) To rewrite the interrupt control register for any interrupt after disabling that interrupt, be careful with the
(3) When using the I flag to disable an interrupt, refer to the sample program fragments shown below as
Examples 1 through 3 show how to prevent the I flag from being set to “1” (interrupts enabled) before the
interrupt control register is rewrited, owing to the effects of the internal bus and the instruction queue
buffer.
Changing any bit other than the IR bit
Changing the IR bit
Example 1:Using the NOP instruction to keep the program waiting until
Example 2:Using the dummy read to keep the FSET instruction waiting
Example 3:Using the POPC instruction to changing the I flag
If while executing an instruction, a request for an interrupt controlled by the register being modified
occurs, the IR bit in the register may not be set to “1” (interrupt requested), with the result that the
interrupt request is ignored. If such a situation presents a problem, use the instructions shown below
to modify the register.
Usable instructions: AND, OR, BCLR, BSET
Depending on the instruction used, the IR bit may not always be cleared to “0” (interrupt not re-
quested). Therefore, be sure to use the MOV instruction to clear the IR bit.
interrupt may occur. Otherwise, disable the interrupt before rewriting the interrupt control register.
instruction to be used.
you set the I flag. (Refer to (2) for details about rewrite the interrupt control registers in the sample
program fragments.)
INT_SWITCH1:
INT_SWITCH2:
INT_SWITCH3:
FCLR
AND.B
NOP
NOP
FSET
FCLR
AND.B
MOV.W
FSET
PUSHC
FCLR
AND.B
POPC
Interrupt
the interrupt control register is modified
I
#00h, 0055h
I
I
#00h, 0055h
MEM, R0
I
FLG
I
#00h, 0055h
FLG
; Disable interrupts.
; Set the TA0IC register to “00
; Four NOP instructions are required when using HOLD function.
; Refer to hardware manual about the number of NOP
; instruction
; Enable interrupts.
; Disable interrupts.
; Set the TA0IC register to “00
; Dummy read.
; Enable interrupts.
; Disable interrupts.
; Set the TA0IC register to “00
; Enable interrupts.
253
16
”.
16
16
”.
”.
5.2 Interrupt Control