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UPD784044 Datasheet, PDF (72/90 Pages) NEC – 16-BIT SINGLE-CHIP MICROCONTROLLER | |||
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µPD784044(A), 784046(A)
(3) Electrical specifications of µPD784044(A2), 784046(A2) (4/6)
AC Characteristics (TA = â40 to +125 ËC, VDD = 4.5 to 5.5 V, VSS = 0 V)
Read/write operation
Parameter
System clock cycle time
Address setup time (vs. ASTBâ)
Address hold time (vs. ASTBâ)
ASTB high-level width
AddressâRDâ delay time
RDââaddress float time
Addressâdata input time
RDââdata input time
ASTBââRDâ delay time
Data hold time (vs. RDâ)
RDââaddress active time
RD low-level width
AddressâLWR, HWRâ delay time
LWR, HWRââdata output time
ASTBââLWR, HWRâ delay time
Data setup time (vs. LWR, HWRâ)
Data hold time (vs. LWR, HWRâ)
LWR, HWRââ ASTBâ delay time
LWR, HWR low-level width
AddressâWAITâ input time
ASTBââWAITâ input time
ASTBââWAIT hold time
ASTBââWAITâ delay time
RDââWAITâ input time
RDââWAIT hold time
RDââWAITâ delay time
LWR, HWRââWAITâ input time
LWR, HWRââWAIT hold time
LWR, HWRââWAITâ delay time
Symbol
tCYK
tSAST
tHSTA
tWSTH
tDAR
tFRA
tDAID
tDRID
tDSTR
tHRID
tDRA
tWRL
tDAW
tDWOD
tDSTW
tSODW
tHWOD
tDWST
tWWL
tDAWT
tDSTWT
tHSTWT
tDSTWTH
tDRWT
tHRWT
tDRWTH
tDWWT
tHWWT
tDWWTH
Expression
(0.5 + a) T â 20
0.5T â 20
(0.5 + a) T â 17
(1 + a) T â 15
(2.5 + a + n) T â 56
(1.5 + n) T â 53
0.5T â 16
0.5T â 14
(1.5 + n) T â 30
(1 + a) T â 15
0.5T â 16
(1.5 + n) T â 25
0.5T â 14
1.5T â 15
(1.5 + n) T â 36
(2 + a) T â 50
1.5T â 40
(1.5 + n) T + 5
(1.5 + n) T â 40
T â 40
(1 + n) T + 5
(1 + n) T â 40
T â 40
(1 + n) T + 5
(1 + n) T â 40
Note Specification when an external wait is inserted
MIN.
MAX.
Unit
100
250
ns
30
ns
30
ns
33
ns
85
ns
0
ns
194
ns
97
ns
34
ns
0
ns
36
ns
120
ns
85
ns
15
ns
34
ns
125
ns
36
ns
135
ns
114
ns
150
ns
110
ns
155
ns
210Note
ns
60
ns
105
ns
160Note
ns
60
ns
105
ns
160Note
ns
Remarks 1. T = tCYK = 1/fCLK (fCLK is internal system clock frequency)
2. a = 1 when an address wait is inserted, otherwise, 0.
3. n indicates the number of the wait cycles by specifying the external wait pins (WAIT) or program-
mable wait control registers 1, 2 (PWC1, PWC2). (n ⥠0. n ⥠1 for tDSTWTH, tDRWTH, tDWWTH).
4. Calculate values in the expression column with the system clock cycle time to be used because
these values depend on the system clock cycle time (tCYK = T). The values in the above expression
column are calculated based on T = 100 ns.
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