atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 408

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

Table 30-13. External Data Memory Characteristics, 2.7 - 5.5 Volts, SRWn1 = 1, SRWn0 = 1
408
0
10
12
14
15
16
Symbol
1/t
t
t
t
t
t
RLDV
RLRH
WHDX
DVWH
WLWH
CLCL
ATmega32U4
Parameter
Oscillator Frequency
Read Low to Data Valid
RD Pulse Width
Data Hold After WR High
Data Valid to WR High
WR Pulse Width
Figure 30-7. External Memory Timing (SRWn1 = 0, SRWn0 = 0
System Clock (CLK
DA7:0 (XMBK = 0)
DA7:0
A15:8
CPU
ALE
WR
RD
)
Prev. addr.
Prev. data
Min
735
485
750
735
4 MHz Oscillator
T1
1
Address
Address
4
2
Max
690
5
T2
6
3a
3b
XX
7
8
13
10
3.0t
2.0t
3.0t
Address
3.0t
T3
15
Min
CLCL
CLCL
CLCL
0.0
12
Data
16
Data
Variable Oscillator
CLCL
9
-15
-15
-15
11
3.0t
T4
14
Max
CLCL
8
7766A–AVR–03/08
-60
Unit
MHz
ns
ns
ns
ns
ns