ST92F124R1 STMicroelectronics, ST92F124R1 Datasheet - Page 146

• Manufacturer Part Number: ST92F124R1
• Description: 8/16-bit Single Voltage Flash Mcu Family With Ram, E?? Emulated Eeprom , Can 2.0b And J1850 Blpd
• Manufacturer: STMicroelectronics

ST92F124/F150/F250 - EXTERNAL MEMORY INTERFACE (EXTMI)
EXTERNAL MEMORY SIGNALS (Cont’d)
Figure 77. Effects of DS2EN on the behavior of DS and DS2
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SYSTEM
CLOCK
AS (MC=0)
ALE (MC=1)
DS
(MC=0)
DS2
(MC=0)
OEN
(MC=1, READ)
OEN
(MC=1, WRITE)
OEN2
(MC=1)
DS
(MC=0)
DS2
(MC=0)
OEN
(MC=1)
OEN2
(MC=1, READ)
(MC=1, READ)
OEN2
(MC=1, WRITE)
(MC=1, WRITE)
DS2EN=0 OR (DS2EN=1 AND UPPER MEMORY ADDRESSED):
DS2EN=1 AND LOWER MEMORY ADDRESSED:
T1
NO WAIT CYCLE
T2
T1
1 DS WAIT CYCLE
DS STRETCH
T2