Table of Contents
Advertisement
Special-
Port Pin
function
Signal
—
EA#
—
V
PP
16.7 ENTERING PROGRAMMING MODES
To execute programs properly, the device must have these minimum hardware connections:
XTAL1 driven, unused input pins strapped, and power and grounds applied. Follow the operating
conditions specified in the datasheet. Place the device into programming mode by applying V
voltage (+12.5 V) to EA# during the rising edge of RESET#.
16.7.1 Selecting the Programming Mode
The PMODE (P0.7:4) value controls the programming mode. PMODE is sampled on the rising
edge of RESET#. You must reset the device to switch programming modes. Table 16-7 lists the
PMODE value for each programming mode. All other PMODE values are reserved.
PROGRAMMING THE NONVOLATILE MEMORY
Table 16-6. Pin Descriptions (Continued)
Program-
Type
ming
Mode
I
All
I
All
Table 16-7. PMODE Values
PMODE Value
Programming Mode
(Hex)
5
Slave programming
6
ROM-dump
9
UPROM programming (MH only)
C
Auto programming
D
PCCB programming (MH only)
Get other manuals https://www.bkmanuals.com
Description
External Access
Controls program mode entry. If EA# is at V
voltage on the rising edge of RESET#, the device
enters programming mode.
EA# is sampled and latched only on the rising edge
of RESET#. Changing the level of EA# after reset
has no effect.
Programming Voltage
During programming, the V
+12.5V (V
voltage). Exceeding the maximum V
PP
voltage specification can damage the device.
PP
pin is typically at
PP
PP
PP
16-13
Advertisement
Table of Contents
