ST92250CV2Q-Auto STMicroelectronics, ST92250CV2Q-Auto Datasheet - Page 147
ST92250CV2Q-Auto
Manufacturer Part Number
ST92250CV2Q-Auto
Description
8-bit MCU for automotive
Manufacturer
STMicroelectronics
Datasheet
1.ST92150JDV1QAUTO.pdf
(430 pages)
Specifications of ST92250CV2Q-Auto
Internal Memory
Single Voltage FLASH up to 256 Kbytes, RAM up to 8Kbytes, 1K byte E3 TM (Emulated EEPROM)
Minimum Instruction Time
83 ns (24 MHz int. clock)
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EXTERNAL MEMORY SIGNALS (Cont’d)
8.2.8 WAIT: External Memory Wait
WAIT (Alternate Function Input, Active low) indi-
cates to the ST9 that the external memory requires
more time to complete the memory access cycle. If
bit EWEN (EIVR) is set, the WAIT signal is sam-
pled with the rising edge of the processor internal
clock during phase T1 or T2 of every memory cy-
cle. If the signal was sampled active, one more in-
ternal clock cycle is added to the memory cycle.
On the rising edge of the added internal clock cy-
Figure 78. External memory Read/Write sequence with external wait request (WAIT pin)
WAIT
SYSTEM
P1, P9
AS (MC=0)
ALE (MC=1)
P0
RW (MC=0)
OEN (MC=1)
WEN (MC=1)
P0
RW (MC=0)
OEN (MC=1)
WEN (MC=1)
DS (MC=0)
CLOCK
ADD.
ADD.
T1
ADDRESS
D.OUT
D.IN
T2
ADDRESS
T1
ADDRESS
ADDRESS
ST92124xxx-Auto/150xxxxx-Auto/250xxxx-Auto
cle, WAIT is sampled again to continue or finish
the memory cycle stretching. Note that if WAIT is
sampled active during phase T1 then AS is
stretched, while if WAIT is sampled active during
phase T2 then DS is stretched. WAIT is enabled
via software as the Alternate Function input of the
associated I/O port bit (refer to specific ST9 ver-
sion to identify the specific port and pin). Refer to
Figure
D.IN
D.OUT
T2
78.
ADD.
T1
ADD.
ADDRESS
T2
DATA OUT
D.IN
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