Datasheet

R01DS0011EJ0101 Rev.1.01 Page 92 of 102
Oct 28, 2011
R8C/LA3A Group, R8C/LA5A Group, R8C/LA6A Group, R8C/LA8A Group 5. Electrical Characteristics
5.2.5 AC Characteristics
Note:
1. 1t
CYC = 1/f1(s)
Table 5.53 Timing Requirements of Synchronous Serial Communication Unit (SSU)
(V
CC = 1.8 to 5.5 V, VSS = 0 V, and Topr = −20 to 85°C (N version)/ −40 to 85°C
(D version)
, unless otherwise specified.)
Symbol Parameter Conditions
Standard
Unit
Min. Typ. Max.
t
SUCYC SSCK clock cycle time 4 – -
t
CYC
(1)
tHI SSCK clock “H” width 0.4 – 0.6 tSUCYC
tLO SSCK clock “L” width 0.4 – 0.6 tSUCYC
tRISE SSCK clock rising
time
Master – – 1
t
CYC
(1)
Slave – – 1 µs
t
FALL SSCK clock falling
time
Master – – 1
t
CYC
(1)
Slave – – 1 µs
t
SU SSO, SSI data input setup time 100 – – ns
t
H SSO, SSI data input hold time 1 – –
t
CYC
(1)
tLEAD
SCS setup time
Slave 1t
CYC + 50 – – ns
t
LAG
SCS hold time
Slave 1t
CYC + 50 – – ns
t
OD SSO, SSI data output delay time – – 1tCYC + 20
ns
t
SA SSI slave access time 2.7 V ≤ VCC ≤ 5.5 V – – 1.5tCYC + 100 ns
1.8 V
≤ VCC < 2.7 V – – 1.5tCYC + 200 ns
t
OR SSI slave out open time 2.7 V ≤ VCC ≤ 5.5 V – – 1.5tCYC + 100 ns
1.8 V
≤ VCC < 2.7 V – – 1.5tCYC + 200 ns