upd17240 Renesas Electronics Corporation., upd17240 Datasheet - Page 63

• Manufacturer Part Number: upd17240
• Description: 4-bit Single-chip Microcontrollers For Small General-purpose Infrared Remote Control Transmitters
• Manufacturer: Renesas Electronics Corporation.

8.2
8.2.1
This section describes the flags of the interrupt controller.
This flag reads the INT pin status.
When a high level is input to the INT pin, this flag is set to 1; when a low level is input, the flag is reset to 0.
(1) Interrupt request flag and interrupt enable flag
(2) EI/DI instruction
Hardware of Interrupt Controller
The interrupt request flag (IRQ×××) is set to 1 when an interrupt request is generated, and is automatically
cleared to 0 when the interrupt processing is executed.
An interrupt enable flag (IP×××) is provided for each interrupt request flag. When the IP××× flag is 1, the
interrupt is enabled; when it is 0, the interrupt is disabled.
Whether an acknowledged interrupt is executed or not is specified by the EI or DI instruction.
When the EI instruction is executed, INTE (interrupt enable flag), which enables the interrupt, is set to 1. The
INTE flag is not registered on the register file. Consequently, the status of this flag cannot be checked by
an instruction.
The DI flag clears the INTE flag to 0 to disable all the interrupts.
The INTE flag is also cleared to 0 at reset, disabling all the interrupts.
INT
3
0
IRQTM
IRQ
IRQBTM
Request Flag
Interrupt
2
0
Table 8-2. Interrupt Request Flags and Interrupt Enable Flag
µ PD17240, 17241, 17242, 17243, 17244, 17245, 17246
Reset by 8-bit timer.
Set when edge of INT pin input signal is detected
Reset by basic interval timer.
0
1
INT
Signal Setting Interrupt Request Flag
0
Data Sheet U15002EJ1V1DS
RF: 0FH
Address
INT
0
1
INT pin: Low level
INT pin: High level
Undefined
After reset
INT pin level detection
R/W
R
IPTM
IP
IPBTM
Enable Flag
Interrupt
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