Z80181 Zilog., Z80181 Datasheet - Page 61

• Manufacturer Part Number: Z80181
• Description: SMART ACCESS CONTROLLER (SAC)
• Manufacturer: Zilog.

Zilog
AC CHARACTERISTICS (Continued)
CTC Timing
Figure 69 shows the timing for the on-chip CTC. Param-
eters referenced in this figure appear in Table B.
Notes for Table B:
[B1] Timer Mode
[B2] Counter Mode
[B3] Counter Mode Only. When using a cycle time less than 3TcC, parameter #2 must be met.
DS971800500
No
1
2
3
4
5
6
7
8
9
10
11
Symbol
TdCr(INTf)
TsCTRr(Cr)c
TsCTR(Ct)
TdCTRr(INTf)
TcCTR
TwCTRh
TwCTRl
TrCTR
TfCTR
TdCr(ZCr)
TdCf(ZCf)
CLK/TRG
CLK/TRG
Counter
ZC/TO
Clock
Timer
/INT
Parameter
Clock Rise to /INT Fall Delay
CLK/TRG Rise to Clock Rise
Setup Time for Immediate Count
CLK/TRG Rise to Clock Rise
Setup Time for Enabling of Prescaler
On Following Clock Rise
CLK/TRG Rise to /INT Fall Delay
TsCTR(C) Satisfied
TsCTR(C) Not Satisfied
CLK/TRG Cycle Time
CLK/TRG Width (Low)
CLK/TRG Width (High)
CLK/TRG Rise Time
CLK/TRG Fall Time
Clock Rise to ZC/TO Rise Delay
Clock Fall to ZC/TO Fall Delay
2
3
Table B. CTC Timing Parameters
4
Figure 69. CTC Timing
6
10
1
5
9
(2TcC)
Min
90
90
90
7
Z8018110
11
TcC+(1)+(3)
(TcC+100)
(1)+(3)
Max
DC
DC
DC
90
30
30
80
80
S
MART
8
A
CCESS
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
C
ONTROLLER
Note
[B2]
[B1]
[B2]
[B1]
[B2]
[B3]
Z80181
2-61
SAC
™