MC68HC711xxxx Motorola, MC68HC711xxxx Datasheet - Page 54

• Manufacturer Part Number: MC68HC711xxxx
• Description: Microcontrollers
• Manufacturer: Motorola

Operating Modes and On-Chip Memory
2.4.2 Programming the EPROM with Downloaded Data
2.4.3 EPROM and EEPROM Programming Control Register
Data Sheet
54
When using this method, the EPROM is programmed by software while in the
special test or bootstrap modes. User-developed software can be uploaded
through the SCI or a ROM-resident EPROM programming utility can be used. The
12-volt nominal programming voltage must be present on the XIRQ/V
use the resident utility, bootload a 3-byte program consisting of a single jump
instruction to $BF00. $BF00 is the starting address of a resident EPROM
programming utility. The utility program sets the X and Y index registers to default
values, then receives programming data from an external host, and puts it in
EPROM. The value in IX determines programming delay time. The value in IY is a
pointer to the first address in EPROM to be programmed (default = $D000).
When the utility program is ready to receive programming data, it sends the host
the $FF character. Then it waits. When the host sees the $FF character, the
EPROM programming data is sent, starting with the first location in the EPROM
array. After the last byte to be programmed is sent and the corresponding
verification data is returned, the programming operation is terminated by resetting
the MCU.
For more information, Motorola application note AN1060 entitled
Bootstrap Mode
The EPROM and EEPROM programming control register (PPROG) enables the
EPROM programming voltage and controls the latching of data to be programmed.
ODD — Program Odd Rows in Half of EEPROM (Test) Bit
EVEN — Program Even Rows in Half of EEPROM (Test) Bit
1. MC68HC711E9 only
•
•
Refer to
Refer to
Address: $103B
Reset:
Read:
Write:
For MC68HC711E9, PPROG is also the EEPROM programming control
register.
For the MC68HC711E20, EPROM programming is controlled by the
EPROG register and EEPROM programming is controlled by the PPROG
register.
2.5
2.5
ODD
Bit 7
Operating Modes and On-Chip Memory
0
Figure 2-14. EPROM and EEPROM Programming
EEPROM.
EEPROM.
has been included at the back of this document.
EVEN
6
0
Control Register (PPROG)
ELAT
5
0
(1)
BYTE
4
0
ROW
3
0
ERASE
M68HC11E Family — Rev. 5
2
0
M68HC11
EELAT
1
0
PPE
MOTOROLA
pin. To
EPGM
Bit 0
0