HD64F2149 Datasheet, PDF (728/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Notes on Use of Auto-Program Mode
• In auto-program mode, 128 bytes are programmed simultaneously. This should be carried out
by executing 128 consecutive byte transfers.
• A 128-byte data transfer is necessary even when programming fewer than 128 bytes. In this
case, H'FF data must be written to the extra addresses.
• The lower 8 bits of the transfer address must be H'00 or H'80. If a value other than an effective
address is input, processing will switch to a memory write operation but a write error will be
flagged.
• Memory address transfer is performed in the second cycle (figure 22.20). Do not perform
transfer after the second cycle.
• Do not perform a command write during a programming operation.
• Perform one auto-programming operation for a 128-byte block for each address.
Characteristics are not guaranteed for two or more programming operations.
• Confirm normal end of auto-programming by checking FO6. Alternatively, status read mode
can also be used for this purpose (FO7 status polling uses the auto-program operation end
identification pin).
• The status polling FO6 and FO7 pin information is retained until the next command write.
Until the next command write is performed, reading is possible by enabling CE and OE.
22.10.6 Auto-Erase Mode
AC Characteristics
Table 22.18 AC Characteristics in Auto-Erase Mode
Conditions: V_CC = 3.3 V ±0.3 V, V_SS = 0 V, T_a = 25°C ±5°C
Item
Command write cycle
CE hold time
CE setup time
Data hold time
Data setup time
Write pulse width
Status polling start time
Status polling access time
Memory erase time
WE rise time
WE fall time
694
Symbol
t _nxtc
t _ceh
t _ces
t _dh
t _ds
t _wep
t _ests
t _spa
t _erase
t_r
t_f
Min
20
0
0
50
50
70
1
—
100
—
—
Max
—
—
—
—
—
—
—
150
40000
30
30
Unit
µs
ns
ns
ns
ns
ns
ms
ns
ms
ns
ns