HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 148

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

5.7.2
Figure 5.9 shows a block diagram of the address break.
5.7.3
If the CPU prefetches an address specified in BAR by setting ABRKCR and BAR, an address
break interrupt can be generated. This address break function generates an interrupt request to the
interrupt controller at prefetch, and determines the priority by the interrupt controller. When an
interrupt is accepted, an interrupt exception handling is activated after the current instruction has
been completed. Note that the interrupt mask control according to the I and UI bits in CCR of the
CPU is invalid to an address break interrupt.
To use the address break function, set each register as follows:
1. Set a break address in the A23 to A1 bits in BAR.
2. Set the BIE bit in ABRKCR to 1 to enable the address break.
When the setting conditions are satisfied, the CMF flag in ABRKCR is set to 1 to request an
interrupt. The interrupt source should be determined by the interrupt handling routine if necessary.
Rev. 2.0, 08/02, page 108 of 788
When the BIE bit is cleared to 0, an address break is not requested.
Block Diagram
Operation
Internal address
(internal signal)
Prefetch signal
Figure 5.9 Address Break Block Diagram
Comparator
BAR
Match
signal
ABRKCR
Control
logic
Address break
interrupt request