DF2148ATE20 Renesas Electronics America, DF2148ATE20 Datasheet - Page 186

• Manufacturer Part Number: DF2148ATE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148ATE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: Host Interface, I²C, IrDA, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2148ATE20; HD64F2148ATE20

Section 5 Interrupt Controller
5.5.3
Three-level masking is implemented for IRQ interrupts and on-chip supporting module interrupts
by means of the I and UI bits in the CPU’s CCR, and ICR.
For example, if the interrupt enable bit for an interrupt request is set to 1, and H'20, H'00, and H'00
are set in ICRA, ICRB, and ICRC, respectively, (i.e. IRQ2 and IRQ3 interrupts are set to control
level 1 and other interrupts to control level 0), the situation is as follows:
Figure 5.9 shows the state transitions in these cases.
Rev. 4.00 Sep 27, 2006 page 140 of 1130
REJ09B0327-0400
Control level 0 interrupt requests are enabled when the I bit is cleared to 0, and disabled when
set to 1.
Control level 1 interrupt requests are enabled when the I bit or UI bit is cleared to 0, and
disabled when both the I bit and the UI bit are set to 1.
When I = 0, all interrupts are enabled
(Priority order: NMI > IRQ2 > IRQ3 > address break > IRQ0 > IRQ1 ...)
When I = 1 and UI = 0, only NMI, IRQ2, IRQ3 and address break interrupts are enabled
When I = 1 and UI = 1, only NMI and address break interrupts are enabled
Exception handling execution
All interrupts enabled
Interrupt Control Mode 1
or I
Figure 5.9 Example of State Transitions in Interrupt Control Mode 1
1, UI
1
I
0
Only NMI interrupts and
address break enabled
I
I
1, UI
0
0
UI
0
Exception handling execution
Only NMI, IRQ2, IRQ3,
and address break
interrupts enabled
or UI
1