psd835g2 STMicroelectronics, psd835g2 Datasheet - Page 35

• Manufacturer Part Number: psd835g2
• Description: Configurable Memory System On A Chip For 8-bit Microcontrollers
• Manufacturer: STMicroelectronics

PSD835G2
Table 7.
1. All bus cycles are WRITE bus cycles, except the ones with the “Read” label
2. All values are in hexadecimal:
3. Only address bits A11-A0 are used in instruction decoding. A15-A12 (or A16-A12) are don’t care.
4. The Sector Select pins (FS0-FS7 or CSBOOT0-CSBOOT3) of the sector or whole memory to be erased, or verified, must
5. No Unlock or instruction cycles are required when the device is in the READ mode
Read
Read Primary
Flash ID
Read Sector
Protection
Program a Flash
Byte
Flash Sector
Erase
Flash Bulk Erase
Suspend Sector
Erase
Resume Sector
Erase
Reset
Unlock Bypass
Unlock Bypass
Program
Unlock Bypass
Reset
Instruction
X = Don’t Care.
RA = Address of the memory location to be read
RD = Data read from location RA during the READ cycle
PA = Address of the memory location to be programmed. Addresses are latched on the falling edge of Write Strobe (WR,
CNTL0). PA is an even address for PSD in word programming mode.
PD = Data to be programmed at location PA. Data is latched on the rising edge of Write Strobe (WR, CNTL0)
SA = Address of the sector to be erased or verified.
be Active (High).
Sector Select (FS0-FS7 or CSBOOT0-CSBOOT3) signals are active high, and are defined in PSDsoft.
(13)
(5)
(9)
(10)
(11)
(6)
(13)
(6)13)
(12)
(6)(7)(8)
Flash memory can also be read by using special instructions to retrieve particular Flash
device information (sector protect status and ID).
Instructions
FS0-FS7 or
CSBOOT0-
CSBOOT3
(4)
1
1
1
1
1
1
1
1
1
1
1
1
(1)(2)(3)
“Read” RA
@ RD
AAh@
555h
AAh@
555h
AAh@
555h
AAh@
555h
AAh@
555h
B0h@
XXXh
30h@
XXXh
F0h@
any
address
AAh@
555h
A0h@
XXXh
90h@
XXXh
Cycle 1
55h@
AAAh
55h@
AAAh
55h@
AAAh
55h@
AAAh
55h@
AAAh
55h@
AAAh
PD@ PA
00h@
XXXh
Cycle 2
90h@
555h
90h@
555h
A0h@
555h
80h@
555h
80h@
555h
20h@
555h
Cycle 3
Read
identifier
@X01h
Read
identifier
00h or 01h
@X02h
PD@ PA
AAh@ 555h
AAh@ 555h
Cycle 4
55h@
AAAh
55h@
AAAh
Cycle 5
Detailed operation
30h@
SA
10h@
555h
Cycle 6
30h
next SA
Cycle 7
35/120
(7)
@