mc68hc705c9a Freescale Semiconductor, Inc, mc68hc705c9a Datasheet - Page 114

• Manufacturer Part Number: mc68hc705c9a
• Description: M68hc05 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

EPROM Programming
A.4 Programming Register (PROG)
This register is used to program the EPROM array. To program a byte of EPROM, set LATCH, write data
to the desired address, and set EPGM for t
LATCH — EPROM Latch Control Bit
EPGM — EPROM Program Control Bit
114
This read/write bit controls the latching of the address and data buses when programming the EPROM.
This read/write bit controls whether the programming voltage is applied to the EPROM array. For
programming, this bit can be set only if the LATCH bit has been set previously. Both EPGM and LATCH
cannot be set in the single write.
1 = Address and data buses latched when the following instruction is a write to 1 of the EPROM
0 = EPROM address and data bus configured for normal reading
1 = Programming voltage applied to EPROM array
0 = Programming voltage not applied to EPROM array
locations. Normal reading is disabled if LATCH = 1.
Bits 7–3 and bit 1 MUST be set to 0 when writing to the EPROM
programming register.
$001X
Reset:
Read:
Write:
Bit 7
0
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
Figure A-1. EPROM Programming Register
6
0
5
0
EPGM
.
NOTE
4
0
3
0
LATCH
2
0
1
0
Freescale Semiconductor
EPGM
Bit 0
0