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参数资料
型号： MC68HC05SB7
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装： MO-150, SSOP-28
文件页数： 74/170页
文件大小： 2161K
代理商： MC68HC05SB7
August 27, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05SB7
MOTOROLA
REV 2.1
A-3
The OSCS bit enables the OSC1 and OSC2 pins for external oscillator connec-
tion. OSC1 replaces PB2/CS0 and OSC2 replaces PB3/CS1. This is selected by a
mask option on the MC68HC05SB7 device.
A.5
BOOTLOADER MODE
Bootloader mode is entered upon the rising edge of RESET if IRQ/VPP pin is at
VTST and PB1/TCAP at VDD. The Bootloader program is masked in the ROM area
from $1E00 to $1FEF. This program handles copying of user code from an exter-
nal EPROM into the on-chip EPROM. The bootload function has to be done from
an external EPROM. The bootloader performs one programming pass at 1ms per
byte then does a verify pass.
A.6
EPROM PROGRAMMING
This section describes how to program the 6160-byte EPROM and the EPROM
security bit.
In packages with no quartz window, the EPROM functions as one-time program-
mable ROM (OTPROM)
Programming the on-chip EPROM is achieved by using the Program Control Reg-
ister located at address $001E.
The programming software copies to the 6144-byte space located at EPROM
addresses $0600 – $1DFF and to the 16-byte space at addresses $1FF0 – $1FFF
which includes the mask option register (MOR) at address $002F.
Please contact Motorola for programming board availability.
A.6.1 EPROM Programming Register (EPROG)
The EPROM programming register shown in Figure A-3 contains the control bits
for programming the EPROM and MOR. In normal operation, the EPROM pro-
gramming register is a read-only register that contains all logic zeros.
EPGM — EPROM Programming
This read/write bit applies the voltage from the IRQ/VPP pin to the EPROM. To
write the EPGM bit, the ELAT bit must already be set. Clearing the ELAT bit
also clears the EPGM bit. Reset clears EPGM.
1 =
EPROM programming power switched on.
0 =
EPROM programming power switched off.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
EPROG
R
00000
ELAT
MPGM
EPGM
$001C
W
reset:
00000000
UNIMPLEMENTED
RESERVED FOR TEST
Figure A-3. EPROM Programming Register (EPROG)
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