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| 型号： | 7548 |
| 厂商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 53/73页 |
| 文件大小： | 1255K |
| 代理商： | 7548 |
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Rev.2.00
REJ03B0210-0200
Mar 15, 2007
Page 53 of 70
7548 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
NOTES ON PROGRAMMING
(1) Processor Status Register
The contents of the processor status register (PS) after reset are
undefined except for the interrupt disable flag I which is “1”.
After reset, initialize flags which affect program execution. In
particular, it is essential to initialize the T flag and the D flag
because of their effect on calculations.
(2) Interrupts
The contents of the interrupt request bit do not change even if the
BBC or BBS instruction is executed immediately after they are
changed by program because this instruction is executed for the
previous contents. For executing the instruction for the changed
contents, execute one instruction before executing the BBC or
BBS instruction.
(3) Decimal Calculations
For calculations in decimal notation, set the decimal mode
flag D to “1”, then execute the ADC instruction or SBC
instruction. In this case, execute SEC instruction, CLC
instruction or CLD instruction after executing one
instruction before the ADC instruction or SBC instruction.
In the decimal mode, the values of the N (negative), V
(overflow) and Z (zero) flags are invalid.
(4) Ports
The values of the port direction registers cannot be read. That is,
it is impossible to use the LDA instruction, memory operation
instruction when the T flag is “1”, addressing mode using
direction register values as qualifiers, and bit test instructions
such as BBC and BBS.
It is also impossible to use bit operation instructions such as CLB
and SEB and read/modify/write instructions of direction registers
for calculations such as ROR.
For setting direction registers, use the LDM instruction, STA in-
struction, etc.
(5) A/D Conversion
Do not execute the STP instruction during A/D conversion.
(6) Instruction Execution Timing
The instruction execution time can be obtained by multiplying
the frequency of the internal clock
φ
by the number of cycles
mentioned in the machine-language instruction table.
The frequency of the internal clock
φ
is the same as that of the
φ
SOURCE in double-speed mode, twice the
φ
SOURCE cycle in
high-speed mode, 4 times the
φ
SOURCE cycle in middle-speed
mode and 8 times the
φ
SOURCE cycle in low-speed mode.
(7) CPU Mode Register
The processor mode bits can be written only once after releasing
reset. Always set them to “00
2
”. After written, rewriting any data
to these bits is disabled because they are locked. (Emulator MCU
is excluded.)
Also, the stack page bit (bit 2) is not locked.
In order to prevent error-writing to the processor mode bits (at
program runaway), write the CPU mode register at the start of
the program that runs after releasing reset.
(8) State transition
Do not stop the clock selected as the operation clock because of
setting of bits 0 to 2.
NOTES ON HARDWARE
(1) Handling of Power Source Pin
In order to avoid a latch-up occurrence, connect a capacitor
suitable for high frequencies as bypass capacitor between power
source pin (V
CC
pin) and GND pin (V
SS
pin). A ceramic
capacitor of 0.01
μ
F to 0.1
μ
F is recommended.
Connect a capacitor across the power source pin and GND pin
with the shortest possible wiring.
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PDF描述 |
|---|---|
| 7549 | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 75HQ | SCHOTTKY RECTIFIER |
| 75HQ030 | SCHOTTKY RECTIFIER |
| 75HQ035 | SCHOTTKY RECTIFIER |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 7548_07 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:Standard Characteristics |
| 7548_0710 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 75481-001 | 功能描述:集管和线壳 BACKPANEL PINS RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector |
| 75481-002 | 功能描述:集管和线壳 BERGPIN - WITH LARGE STA-R RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector |
| 75481-004 | 功能描述:集管和线壳 BERGPIN RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector |
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