H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 150

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 5 Interrupt Controller
The above contention will not occur if an enable bit or interrupt source flag is cleared to 0 while
the interrupt is masked.
5.5.2
Instructions that disable interrupts are LDC, ANDC, ORC, and XORC. After any of these
instructions is executed, all interrupts including NMI are disabled and the next instruction is
always executed. When the I bit is set by one of these instructions, the new value becomes valid
two states after execution of the instruction ends.
5.5.3
There are times when interrupt acceptance is disabled by the interrupt controller.
The interrupt controller disables interrupt acceptance for a 3-state period after the CPU has
updated the mask level with an LDC, ANDC, ORC, or XORC instruction.
Rev. 3.00 Sep 15, 2006 page 116 of 988
REJ09B0330-0300
Internal
address bus
Internal
write signal
TGIEA
TGFA
TGI0A
interrupt signal
Instructions That Disable Interrupts
Times when Interrupts Are Disabled
Figure 5.8 Contention between Interrupt Generation and Disabling
TIER0 write cycle by CPU
TIER0 address
TGI0A exception handling