Table 6-13 Compensation Value (Z) For Interrupt Handling Time - Fujitsu MB90420/5 (A) Series Hardware Manual

MB90420/5 (A) SERIES F
• At data counter (DCT) count termination (at final data transfer)
2
At EI OS data transfer, since the hardware interrupt is started, the interrupt handling time is added. The
2
EI OS handling time at count termination is calculated by the following expression.
2
handling
EI OS time at count termination = EI
The interrupt handling time depends on the address indicated by the stack pointer. Table 6-13 shows the
compensation value (Z) of the interrupt handling time.

Table 6-13 Compensation Value (Z) for Interrupt Handling Time

External area (8-bit address)
External area (even address)
External area (odd address)
Internal area (even address)
Internal area (odd address)
• At termination by termination request from resource (I/O)
2
When the EI OS data transfer is terminated (ICR: S1, SO = 11) on the way by the termination request from
the resource (I/O), the data transfer is not performed and the hardware interrupt is started. In this case,
2
the EI OS handling time is calculated by the following expression. Z in the expression is the compensation
value of the interrupt handling time (Table 6-13).
OS handling time = 36 + 6 × Z machine cycles
2
EI
Remark: One machine cycle is equal to one clock cycle of the machine clock (φ).
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
OS handling time at data transfer + (21 + 6 × Z) machine cycles
2
Address Indicated by Stack Pointer
Interrupt handling time
Compensation Value (Z)
+4
+1
+4
0
+2
6-32
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