參數(shù)資料
型號(hào)： MC68HC705CL4FU
廠商： MOTOROLA INC
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 1.84 MHz, MICROCONTROLLER, PQFP80
封裝： QFP-80
文件頁(yè)數(shù)： 99/101頁(yè)
文件大?。?/td> 517K
代理商： MC68HC705CL4FU
February 12, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL4
MOTOROLA
REV 2.0
A-3
A.3
EPROM
The user EPROM consists of 6112 bytes from $0800 to $1FDF and 16 bytes of
user vectors from $1FF0 to $1FFF.
The bootstrap ROM is located from $0600 to $07FF.
The bootstrap vectors are located from $1FE0 to $1FEF.
A.4
BOOTSTRAP MODE
Bootstrap mode is entered upon the rising edge of RESET if the IRQ/VPP pin is at
VTST and the PB5 pin is at logic one. The Bootstrap program is mask in the ROM
area from $0600 to $07FF. This program handles copying of user code from an
external EPROM into the on-chip EPROM.
The user code must be a one-to-one correspondence with the internal EPROM
addresses.
A.5
EPROM PROGRAMMING
Programming the on-chip EPROM is achieved by using the Program Control
Register located at address $1C.
Please contact Motorola for programming board availability.
A.5.1 Program Control Register (PCR)
This register is provided for programming the on-chip EPROM in the
MC68HC705CL4
.
ELAT—EPROM LATch control
0 =
EPROM address and data bus congured for normal reads
1 =
EPROM address and data bus congured for programming (writes
to EPROM cause address and data to be latched). EPROM is in
programming mode and cannot be read if ELAT is 1. This bit should
not be set when no programming voltage is applied to the VPP pin.
PGM—EPROM ProGraM command
0 =
Programming power is switched OFF from EPROM array.
1 =
Programming power is switched ON to EPROM array. If ELAT
≠1,
then PGM = 0.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
PCR
R
ELAT
PGM
$001C
W
RESET
00000000
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