MC68HC711PH8 Motorola, MC68HC711PH8 Datasheet - Page 70
MC68HC711PH8
Manufacturer Part Number
MC68HC711PH8
Description
High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit
Manufacturer
Motorola
Datasheet
1.MC68HC711PH8.pdf
(264 pages)
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08/Apr/97@13:55 [DS97 v 4.1]
EXCOL — Select extra columns
The EXCOL bit always reads zero in normal modes and may be read or written only in special
modes.
The extra column may be accessed at bit 7; addresses use bits 15–5, bits 4–0 must be ones.
EXROW — Select extra rows
This bit always reads zero in normal modes and may be read or written only in special modes.
There are six extra rows (two in each block). Addresses use bits 6–0, bits 11–7 must be zeros.
(The high nibble determines which 16K block is accessed.)
EPGM — EPROM program command
This bit can be read at any time, but may only be written if ELAT is set.
Note:
3.4.1.2
The EPROM may be programmed and verified in software, via the MCU, using the following
procedure. The ROMON bit in the CONFIG register should be set. To use this method in special
bootstrap mode, the external EPROM programming voltage must be applied on pin VPPE. On
entry, A contains the data to be programmed and X contains the EPROM address.
EPROG LDAB
User-developed software can be uploaded through the SCI, or an EPROM programming utility
resident in the bootstrap ROM can be used. To use the resident utility, bootload a three-byte
program into RAM consisting of a single jump instruction to $BF00 (the starting address of a
MOTOROLA
3-24
1 (set)
0 (clear) –
1 (set)
0 (clear) –
1 (set)
0 (clear) –
STAB
STAA
LDAB
STAB
JSR
CLR
If ELAT = 0 (normal operation) then EPGM = 0 (programming voltage disconnected).
EPROM programming
–
–
–
#$20
$002B Set ELAT bit (PGM=0) to enable EPROM latches.
$0, X Store data to EPROM address
#$21
$002B Set EPGM bit, with ELAT=1, to enable prog. voltage
DLYEP Delay tEPROG
$002B Turn off programming voltage and set to READ mode
User array disabled; extra column selected.
User array selected.
User array disabled; extra rows selected.
User array selected.
Programming voltage (V
Programming voltage (V
OPERATING MODES AND ON-CHIP MEMORY
—this line does not form part of the document—
PPE
PPE
) switched to the EPROM array.
) disconnected from the EPROM array.
PH8.DS03/Modes+mem
MC68HC11PH8
TPG
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