參數(shù)資料
型號(hào)： HMS77C2001
英文描述： [General Purpose(2) : ADC/ LED/ SCI/ PWM]
中文描述： [通用（2）：藝術(shù)發(fā)展局/發(fā)光/工商/脈寬調(diào)制]
文件頁(yè)數(shù)： 23/59頁(yè)
文件大小： 660K
代理商： HMS77C2001
HMS77C2000/2001
20
Nov. 2002 Ver 1.1
9.2.2 SPECIAL FUNCTION REGISTERS
The Special Function Registers (SFRs) are registers used
by the CPU and peripheral functions to control the opera-
tion of the device (Table 9-1).
The special registers can be classified into two sets. The
special function registers associated with the “core” func-
tions are described in this section. Those related to the op-
eration of the peripheral features are described in the
section for each peripheral feature.
Legend: Shaded boxes = unimplemented or unused, - = unimplemented, read as ‘0’ (if applicable)
x = unknown, u = unchanged, q = see the tables in Section 12.7 for possible values.
Address
Name
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Power-On
Reset
All other
resets
1
N/A
TRIS
-
-
I/O control registers
--11 1111
--11 1111
N/A
OPTION
Contains control bits to configure Timer0, Timer0/WDT prescaler,
wake-up change, weak pull-up
1111 1111
1111 1111
00
H
INDF
Uses contents of FSR to address data memory (not a physical reg-
ister)
xxxx xxxx
uuuu uuuu
01
H
TMR0
8-bit real-time clock/counter
xxxx xxxx
uuuu uuuu
02
H2
PCL
Low order 8bits of PC
1111 1111
1111 1111
03
H
STATUS
UPWUF
-
PA0
TO
PD
Z
DC
C
0001 1xxx
q00q quuu
3
04
H
FSR
(HMS77C2000)
Indirect data memory address pointer
111x xxxx
111u uuuu
04
H
FSR
(HMS77C2001)
Indirect data memory address pointer
110x xxxx
11uu uuuu
05
H
OSCCAL
CAL4
CAL3
CAL2
CAL1
CAL0
-
PFDF
PFDEN
1000 0000
1000 0000
06
H
UPIO
-
-
UP5
UP4
UP3
UP2
UP1
UP0
--xx xxxx
--uu uuuu
TABLE 9-1 SPECIAL FUNCTION REGISTER SUMMARY
1. Other (non power-up) resets include external reset through RESET, watchdog timer and wake-up on pin change reset.
2. The upper byte of the Program Counter is not directly accessible. See Section 9.6 for an explanation of how to access
these bits.
3. If reset was due to wake-up on pin change then bit 7 = 1. All other resets will cause bit 7 = 0.
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