參數(shù)資料
型號: PIC16C432-E/P
廠商: Microchip Technology
文件頁數(shù): 9/70頁
文件大小: 0K
描述: IC MCU CMOS 8-BIT 20MHZ 2K 20DIP
標(biāo)準(zhǔn)包裝: 25
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: LIN(本地互連網(wǎng)絡(luò))
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,WDT
輸入/輸出數(shù): 12
程序存儲(chǔ)器容量: 3.5KB(2K x 14)
程序存儲(chǔ)器類型: OTP
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 125°C
封裝/外殼: 20-DIP(0.300",7.62mm)
包裝: 管件
配用: AC164029-ND - MODULE SKT PROMATEII 20DIP/SSOP
DVA16XP201-ND - ADAPTER DEVICE FOR MPLAB-ICE
2002 Microchip Technology Inc.
Preliminary
DS41140B-page 15
PIC16C432
3.3
PCL and PCLATH
The program counter (PC) is 13-bits wide. The low byte
comes from the PCL register, which is a readable and
writable register. The high byte (PC<12:8>) is not
directly readable or writable and comes from PCLATH.
On any RESET, the PC is cleared. Figure 3-3 shows
the two situations for the loading of the PC. The upper
example in the figure shows how the PC is loaded on a
write to PCL (PCLATH<4:0>
→ PCH). The lower exam-
ple in the figure shows how the PC is loaded during a
CALL
or GOTO instruction (PCLATH<4:3>
→ PCH).
FIGURE 3-3:
LOADING OF PC IN
DIFFERENT SITUATIONS
3.3.1
COMPUTED GOTO
A computed GOTO is accomplished by adding an offset
to the program counter (ADDWF PCL). When doing a
table read using a computed GOTO method, care
should be exercised if the table location crosses a PCL
memory boundary (each 256 byte block). Refer to the
Application
Note,
“Implementing
a
Table
Read”
(AN556).
3.3.2
STACK
The PIC16C432 family has an 8 level deep x 13-bit
wide hardware stack (Figure 3-1 and Figure 3-1). The
stack space is not part of either program or data space
and the stack pointer is not readable or writable. The
PC is PUSHed onto the stack when a CALL instruction
is executed or an interrupt causes a branch. The stack
is POPed in the event of a RETURN, RETLW or a RET-
FIE
instruction execution. PCLATH is not affected by a
PUSH or POP operation.
The stack operates as a circular buffer. This means that
after the stack has been PUSHed eight times, the ninth
PUSH overwrites the value that was stored from the
first PUSH. The tenth PUSH overwrites the second
PUSH (and so on).
PC
12
8
7
0
5
PCLATH<4:0>
PCLATH
Instruction with
ALU result
GOTO, CALL
Opcode <10:0>
8
PC
12
11 10
0
11
PCLATH<4:3>
PCH
PCL
87
2
PCLATH
PCH
PCL
PCL as
Destination
Note 1: There are no STATUS bits to indicate
stack
overflow
or
stack
underflow
conditions.
2: There
are
no
instruction/mnemonics
called PUSH or POP. These are actions
that occur from the execution of the
CALL,
RETURN,
RETLW
and RETFIE
instructions, or the vectoring to an
interrupt address.
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