Z86E09 Datasheet, PDF (10/38 Pages) Zilog, Inc. – Z8 CMOS OTP Microcontrollers

Z86E02/E04/E08/E09 SL1995
Z8 CMOS OTP Microcontrollers
5
OTP Memory Size
The device is offered in 4 memory configurations. Table 3 lists the available sizes
of EPROM memory.
Table 3. EPROM Size
Devices
Z86E02
Z86E04
Z86E08
Z86E09
Memory Size
0.5 KB
1.0 KB
2.0 KB
4.0 KB
Last Address
01FFh
03FFh
07FFh
0FFFh
Device Operation
The device must first be unlocked before it can enter EPROM mode. Otherwise,
the device remains in STANDARD mode. The device cannot be programmed in
STANDARD mode. It can only be programmed in EPROM mode. The following
sequence details the unlock procedure.
Unlock Sequence into EPROM Mode
The following unlock sequence is valid for all parts.
Note: Unlock clock cycles are the X_IN clock cycle entered by the programmer,
not the internal Z8 SCLK cycles.
1. A POR must be completed before unlock operations begin. The X_IN pin must
be in a V_IL state. Allow 50 ms minimum for the device to completely exit POR
to allow the internal signal IRESET to go Low. See Table 5 for POR
conditions.
2. Any time after POR, when the internal signal IRESET is Low. The unlock
sequence can be sent. See Figure 6 and Table 4.
3. While the X_IN pin is in a V_IL state, force Port 2 pins with A5h.
4. Apply one clock pulse to X_IN. The clock pulses should be a minimum of 1µsec
in duration.
5. Force the Port 2 pins with 5Ah.
6. Apply one clock pulse to the X_IN pin.
7. Force the Port 2 pins with A5h.
PS009201-0301
Programming Specification