参数资料
型号: PIC17LC766-08I/PT
厂商: Microchip Technology
文件页数: 113/159页
文件大小: 0K
描述: IC MCU OTP 16KX16 A/D PWM 80TQFP
产品培训模块: Asynchronous Stimulus
标准包装: 119
系列: PIC® 17C
核心处理器: PIC
芯体尺寸: 8-位
速度: 8MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 66
程序存储器容量: 32KB(16K x 16)
程序存储器类型: OTP
RAM 容量: 902 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 16x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 80-TQFP
包装: 托盘
PIC17C7XX
DS30289B-page 56
2000 Microchip Technology Inc.
7.7
Program Counter Module
The Program Counter (PC) is a 16-bit register. PCL, the
low byte of the PC, is mapped in the data memory. PCL
is readable and writable just as is any other register.
PCH is the high byte of the PC and is not directly
addressable. Since PCH is not mapped in data or pro-
gram memory, an 8-bit register PCLATH (PC high
latch) is used as a holding latch for the high byte of the
PC. PCLATH is mapped into data memory. The user
can read or write PCH through PCLATH.
The 16-bit wide PC is incremented after each instruc-
tion fetch during Q1 unless:
Modified by a GOTO, CALL, LCALL, RETURN,
RETLW
, or RETFIE instruction
Modified by an interrupt response
Due to destination write to PCL by an instruction
“Skips” are equivalent to a forced NOP cycle at the
skipped address.
Figure 7-7 and Figure 7-8 show the operation of the
program counter for various situations.
FIGURE 7-7:
PROGRAM COUNTER
OPERATION
FIGURE 7-8:
PROGRAM COUNTER
USING THE CALL AND
GOTO
INSTRUCTIONS
Using Figure 7-7, the operations of the PC and
PCLATH for different instructions are as follows:
a)
LCALL
instructions:
An 8-bit destination address is provided in the
instruction (opcode). PCLATH is unchanged.
PCLATH
→ PCH
Opcode<7:0>
→ PCL
b)
Read instructions on PCL:
Any instruction that reads PCL.
PCL
→ data bus → ALU or destination
PCH
→ PCLATH
c)
Write instructions on PCL:
Any instruction that writes to PCL.
8-bit data
→ data bus → PCL
PCLATH
→ PCH
d)
Read-Modify-Write instructions on PCL:
Any instruction that does a read-write-modify
operation on PCL, such as ADDWF PCL.
Read:
PCL
→ data bus → ALU
Write:
8-bit result
→ data bus → PCL
PCLATH
→ PCH
e)
RETURN
instruction:
Stack<MRU>
→ PC<15:0>
Using Figure 7-8, the operation of the PC and PCLATH
for GOTO and CALL instructions is as follows:
CALL
, GOTO instructions:
A 13-bit destination address is provided in the
instruction (opcode).
Opcode<12:0>
→ PC<12:0>
PC<15:13>
→ PCLATH<7:5>
Opcode<12:8>
→ PCLATH<4:0>
The read-modify-write only affects the PCL with the
result. PCH is loaded with the value in the PCLATH. For
example, ADDWF PCL will result in a jump within the
current page. If PC = 03F0h, WREG = 30h and
PCLATH = 03h before instruction, PC = 0320h after the
instruction. To accomplish a true 16-bit computed jump,
the user needs to compute the 16-bit destination
address, write the high byte to PCLATH and then write
the low value to PCL.
The following PC related operations do not change
PCLATH:
a)
LCALL
, RETLW, and RETFIE instructions.
b)
Interrupt vector is forced onto the PC.
c)
Read-modify-write instructions on PCL
(e.g. BSF PCL).
Internal Data Bus <8>
PCLATH
8
PCH
PCL
8
15
0
7
5 4
0
12
8 7
0
87
PC<15:13>
PCLATH
From Instruction
5
3
8
PCH
PCL
13
15
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