DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 199

• Manufacturer Part Number: DF2211NP24V
• Description: H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
• Manufacturer: Renesas Technology / Hitachi Semiconductor

Section 6 Bus Controller
6.6.4
Wait Control
When accessing external space, this LSI can extend the bus cycle by inserting one or more wait
states (Tw). There are two ways of inserting wait states: program wait insertion and pin wait
insertion using the WAIT pin.
Program Wait Insertion: From 0 to 3 wait states can be inserted automatically between the T
2
state and T
state on an individual area basis in 3-state access space, according to the settings of
3
WCRH and WCRL.
Pin Wait Insertion: Setting the WAITE bit in BCRH to 1 enables wait insertion by means of the
WAIT pin in the H8S/2218 Group. When external space is accessed in this state, program wait
insertion is first carried out according to the settings in WCRH and WCRL. Then, if the WAIT pin
state is inserted. If the WAIT pin is
is low at the falling edge of φ in the last T
or T
state, a T
2
W
W
held low, T
states are inserted until it goes high.
W
Rev.7.00 Dec. 24, 2008 Page 145 of 698
REJ09B0074-0700