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HARDWARE

1-74

3886 Group User’s Manual

q Erase command

The erase command is executed by inputting command code 2016

in the first cycle and command code 2016 again in the second

cycle. The command code is latched into the internal command

___

latch at the rising edges of the WE input in the first cycle and in

the second cycle, respectively. The erase operation is initiated at

___

the rising edge of the WE input in the second cycle, and the

memory contents are collectively erased within 9.5 ms as mea-

sured by the internal timer. Note that data 0016 must be written to

all memory locations before executing the erase command.

Note: An erase operation is not completed by executing the erase

command once. Always be sure to execute an erase verify

command after executing the erase command. When the fail-

ure is found in this verification, the user must repeatedly ex-

ecute the erase command until the pass. Refer to Figure 73

for the erase flowchart.

Fig. 72 Input/output timings during erasing (verify data is output at the same timing as for read.)

q Erase verify command

The user must verify the contents of all addresses after complet-

ing the erase command. The microcomputer enters the erase

verify mode by inputting the verify address and command code

A016 in the first cycle. The address is internally latched at the fall-

___

ing edge of the WE input, and the command code is internally

___

latched at the rising edge of the WE input. When control signals

are input in the second cycle at the timing shown in Figure 72, the

M38869FFAHP/GP outputs the contents of the specified address

to the external.

Note: If any memory location where the contents have not been

erased is found in the erase verify operation, execute the op-

eration of “erase

→ erase verify” over again. In this case,

however, the user does not need to write data 0016 to memory

locations before erasing.

FUNCTIONAL DESCRIPTION

Address

Erase

Erase verify

Verify

address

tWC

tCS

tRRW

tWP

tWPH

tWP

tDE

tDS

2016

A016

Dout

tDS

tDH

Verify data output

tDH

tVSC

tDS

tWP

tWRR

tCS

tCH

tAS

tAH

VIH

VIL

VIH

VIL

VIH

VIL

VIH

VIL

VIH

VIL

VPPH

VPPL

Data

VPP

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