MB91F376G Fujitsu Components, MB91F376G Datasheet - Page 182

• Manufacturer Part Number: MB91F376G
• Manufacturer: Fujitsu Components

Specifications of MB91F376G

• Lead Free Status / Rohs Status: Not Compliant

182
MB91360G Series
(4) Clocks
Maximum operation speed
The module operates with 3 different clocks : The 4 MHz clock OSC4, the 32 kHz clock OSC32 and the R-bus
clock CLKP. Synchronization circuits adapt the different domains.
All 3 clocks are gated. The 32 kHz and the 4 MHz clock are switched off if STRT is 0. CLKPG is gated by RSLEEP
and CLKPG2 by RSLEEP and STRT for the 2 bits, which are set/reset by hardware.
The clock frequencies have to fulfill the following requirements :
1.) Clock ratio
2.) The input frequencies must not exceed the values given in next table.
Standard TDIR mode
Normal operation
T
T
T
OSC32
OSC4
CLKP
Maximum
< 1 / 2 × T
< 1 / 3 × T
> 2 × T
OSC4
OSC32
Examples of valid clock ratios which fulfill requirements 1 and 2
OSC32
+ 3 × T
− 3 / 2 × T
− 2 / 3 × T
CLKP
500 kHz
32 MHz
32 kHz
4 MHz
OSC4
CLKP
OSC32
Maximum operation frequencies
CLKP
31.25 us
31.25 ns
2000 ns
250 ns
13 MHz
4 MHz
4 MHz
4 MHz
OSC32
OSC4
76.9 ns
250 ns
250 ns
250 ns
32 MHz
> 2 MHz
4 MHz
13 MHz
CLKP
OSC4
31.25 ns
250 ns
500 ns
76.9 ns