h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 237

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

φ pin
Bus cycle
CPU
operation
φ pin
Bus cycle
DA bit
CPU cycle
Figure 7.38 External Request/Cycle Steal Mode/Normal Transfer Mode
Figure 7.39 External Request/Cycle Steal Mode/Normal Transfer Mode
1
access
CPU
Bus release
CPU cycle CPU cycle
(No Contention/Dual Address Mode/Low Level Sensing)
(CPU Cycles/Single Address Mode/Low Level Sensing)
access
CPU
access
CPU
DMA
read
CPU access
transfer cycle
DMA single
DMA
write
Bus release
3 cycles
CPU cycle CPU cycle
2 bus cycles
Last transfer cycle
Rev. 2.00, 03/04, page 205 of 534
access
DMA
read
CPU
Last transfer cycle
CPU access
DMA
write
transfer cycle
DMA single
0
Bus release
CPU cycle