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: 38/170页
文件大小: 2161K
代理商: MC68HC05SB7
GENERAL RELEASE SPECIFICATION
August 27, 1998
MOTOROLA
PERSONALITY EPROM
MC68HC05SB7
16-2
REV 2.1
16.1
PEPROM REGISTERS
Two I/O registers control programming and reading of the PEPROM:
The PEPROM bit select register (PEBSR).
The PEPROM status and control register (PESCR).
16.1.1 PEPROM Bit Select Register (PEBSR)
The PEPROM bit select register (PEBSR) selects one of 64 bits in the PEPROM
array. Reset clears all the bits in the PEPROM bit select register.
PEB7 and PEB6 — Not connected to the PEPROM array
These read/write bits are available as storage locations. Reset clears PEB7
and PEB6.
PEB5–PEB0 — PEPROM Bit Select Bits
These read/write bits select one of 64 bits in the PEPROM as shown in
Table 16-1. Bits PEB2–0 select the PEPROM row, and bits PEB5–3 select the
PEPROM column. Reset clears PEB5–PEB0, selecting the PEPROM bit in row
zero, column zero.
16.1.2 PEPROM Status and Control Register (PESCR)
The PEPROM status and control register (PESCR) controls the PEPROM pro-
gramming voltage. This register also transfers the PEPROM bits to the internal
data bus and contains a ag bit when row zero is selected.
PEDATA — PEPROM Data
This read-only bit is the state of the PEPROM sense amplier and shows the
state of the currently selected bit. Reset does not affect the PEDATA bit.
1 = PEPROM data is a logic one.
0 = PEPROM data is a logic zero.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
PEBSR
R
PEB7
PEB6
PEB5
PEB4
PEB3
PEB2
PEB1
PEB0
$000E
W
reset:
00000000
Figure 16-2. PEPROM Bit Select Register (PEBSR)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
PESCR
R
PEDATA
0
PEPGM
0000
PEPRZF
$000F
W
reset:
U
0000001
U = UNAFFECTED BY RESET
Figure 16-3. PEPROM Status and Control Register (PESCR)
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