COP8TAB9 Datasheet, PDF (22/59 Pages) National Semiconductor (TI) – 8-Bit CMOS Flash Microcontroller with 2k Byte or 4k Byte Memory

11.0 In-System Programming
(Continued)
should be placed into the address registers of COP8TAC9
devices. Registers ISPADHI and ISPADLO are cleared to 00
on Reset.
Note: The actual memory address of the Option Register is
0x0FFF (hex), however the MICROWIRE/PLUS ISP routines
require the address FFFF (hex) to be used to read the
Option Register when the Flash Memory is secured.
11.3.3 ISP Write Data Register
The Write Data Register (ISPWR) contains the data to be
written into the specified address. This register is undeter-
mined on Reset.
Bit 7
Bit7
TABLE 9. ISP Write Data Register
Bit 6
Bit6
Bit 5
Bit5
ISPWR
Bit 4 Bit 3
Bit4 Bit3
Bit 2
Bit2
Bit 1
Bit1
Bit 0
Bit0
TABLE 6. High Byte of ISP Address
ISPADHi
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2
Addr 15 Addr 14 Addr 13 Addr 12 Addr 11 Addr 10
Bit 1
Addr 9
Bit 0
Addr 8
TABLE 7. Low Byte of ISP Address
Bit 7
Addr 7
Bit 6
Addr 6
Bit 5
Addr 5
ISPADLO
Bit 4 Bit 3
Addr 4 Addr 3
Bit 2
Addr 2
Bit 1 Bit 0
Addr 1 Addr 0
11.3.2 ISP Read Data Register
The Read Data Register (ISPRD) contains the value read
back from a read operation. This register is undefined on
Reset.
11.3.4 ISP Write Timing Register
The Write Timing Register (PGMTIM) is used to control the
width of the timing pulses for write and erase operations. The
value to be written into this register is dependent on the
frequency of CKI and is shown in Table 10. This register
must be written before any write or erase operation can take
place. It only needs to be loaded once, for each value of CKI
frequency. The MICROWIRE/PLUS ISP routine that is resi-
dent in the boot ROM requires that this register be defined
prior to any access to the Flash memory. Refer to Section
11.7 MICROWIRE/PLUS ISP for more information on avail-
able ISP commands. On Reset, the PGMTIM register is
loaded with the value that corresponds to 10 MHz frequency
for CKI. The best choice for value of PGMTIM will center the
operating frequency in the CKI Frequency Range.
TABLE 8. ISP Read Data Register
Bit 7
Bit7
Bit 6
Bit6
Bit 5
Bit5
ISPRD
Bit 4 Bit 3
Bit4 Bit3
Bit 2
Bit2
Bit 1
Bit1
Bit 0
Bit0
TABLE 10. PGMTIM Register Format
PGMTIM
Register Bit
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
1
0
0
0
0
1
0
1
0
0
0
0
1
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1
0
1
0
0
0
0
1
0
0
0
1
0
1
0
1
0
0
1
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
0
1
0
0
1
1
0
1
1
0
0
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
CKI Frequency Range
25 kHz–50 kHz
50 kHz–100 kHz
75 kHz–150 kHz
125 kHz–250 kHz
200 kHz–400 kHz
275 kHz–550 kHz
425 kHz–850 kHz
625 kHz–1.25 MHz
1.025 MHz–2.05 MHz
1.5 MHz–3 MHz
2.5 MHz–5 MHz
3.75 MHz–7.5 MHz
6.75 MHz–13.5 MHz
11.25 MHz–22.5 MHz
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