參數(shù)資料
型號(hào)： MC68HC05C5CFN
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 11/58頁
文件大?。?/td> 166K
代理商： MC68HC05C5CFN
Page 13
Section 3: Memory
MOTOROLA
MC68HC05C5 Specification Rev. 1.2
address and data buses are configured for normal operation. LATCH is automatically
cleared when LVPI is set. Reset clears this bit.
3.3.1.5
EERC - EEPROM RC Oscillator Control
When this bit is set, the EEPROM section uses the internal RC oscillator instead of the
CPU clock. After setting the EERC bit, delay a time t
RCON to allow the RC oscillator to
stabilize. This bit is readable and writable and should be set by the user when the internal
bus frequency falls below 1.5 MHz. EERC is automatically cleared when LVPI is set.
Reset clears this bit.
3.3.1.6
EEPGM - EEPROM Programming Power Enable
EEPGM must be written to enable (or disable) the EEPGM function. When set, EEPGM
turns on the charge pump and enables the programming (or erasing) power to the
EEPROM array. When clear, this power is switched off. This will enable pulsing of the
programming voltage to be controlled internally. This bit can be read at any time, but can
only be written to if LATCH = 1. If LATCH is not set, then EEPGM cannot be set. LATCH
and EEPGM can not both be set with one write if LATCH is cleared.
EEPGM is
automatically cleared when LVPI is set. EEPGM is automatically cleared when LATCH is
cleared. Reset clears this bit.
3.3.2
PROGRAMMING/ERASING PROCEDURES
To program a byte of EEPROM, set LATCH = CPEN = 1, set ER1 = ER0 = 0, write data
to the desired address and then set EEPGM for a time t
EPGM.
NOTE:
Any bit should be erased before it is programmed. However, if write/
erase cycling is a concern, a procedure can be followed to minimize
the cycling of each bit in each EEPROM byte. Here is the procedure:
If PBEB* = 0, then program the new data over the existing data
without erasing it first
If PBEB*
≠ 0, then erase byte before programming
Where PB = Byte data to be programmed
and EB = Existing EEPROM byte data.
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