AT90CAN64_14 Datasheet, PDF (31/428 Pages) ATMEL Corporation – High-performance, Low-power AVR 8-bit Microcontroller

AT90CAN32/64/128
Note:
1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or
SRW00 (lower sector).
The ALE pulse in period T5 is only present if the next instruction accesses the RAM (internal
or external).
Figure 4-8. External Data Memory Cycles with SRWn1 = 1 and SRWn0 = 0⁽¹⁾
T1
T2
T3
T4
T5
T6
System Clock (CLK_CPU)
ALE
A15:8 Prev. addr.
Address
DA7:0 Prev. data
Address XX
Data
WR
DA7:0 (XMBK = 0) Prev. data
Address
Data
DA7:0 (XMBK = 1) Prev. data
Address
Data
RD
Note:
1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or
SRW00 (lower sector).
The ALE pulse in period T6 is only present if the next instruction accesses the RAM (internal
or external).
Figure 4-9. External Data Memory Cycles with SRWn1 = 1 and SRWn0 = 1⁽¹⁾
T1
T2
T3
T4
T5
System Clock (CLK_CPU)
ALE
A15:8 Prev. addr.
Address
DA7:0 Prev. data
Address XX
Data
T6
T7
WR
DA7:0 (XMBK = 0) Prev. data
DA7:0 (XMBK = 1) Prev. data
Address
Address
Data
Data
RD
Note:
1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or
SRW00 (lower sector).
The ALE pulse in period T7 is only present if the next instruction accesses the RAM (internal
or external).
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7679H–CAN–08/08