HT66F30 datasheet(28/224 Pages) HOLTEK

28 / 224 page

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

Rev. 1.00

November 3, 2009

¨ HT66F60

Bit

76543210

Name

¾¾

PMBP0

¾¾

DMBP2

DMBP1

DMBP0

R/W

¾¾

R/W

¾¾

R/W

POR

¾¾

000

Bit7~6

Unimplemented, read as

²0²

Bit 5

PMBP0: Select Program Memory Banks

0: Bank 0, Program Memory Address is from 0000H ~ 1FFFH

1: Bank 1, Program Memory Address is from 2000H ~ 2FFFH

Bit4~3

Unimplemented, read as

²0²

Bit2~0

DMBP2 ~ DMBP0: Select Data Memory Banks

000: Bank 0

001: Bank 1

010: Bank 2

011: Bank 3

100: Bank 4

101~111: Undefined

Accumulator

- ACC

The Accumulator is central to the operation of any

microcontroller and is closely related with operations

carried out by the ALU. The Accumulator is the place

where all intermediate results from the ALU are stored.

Without the Accumulator it would be necessary to write

the result of each calculation or logical operation such

as addition, subtraction, shift, etc., to the Data Memory

resulting in higher programming and timing overheads.

Data transfer operations usually involve the temporary

storage function of the Accumulator; for example, when

transferring data between one user defined register and

another, it is necessary to do this by passing the data

through the Accumulator as no direct transfer between

two registers is permitted.

Program Counter Low Register

- PCL

To provide additional program control functions, the low

byte of the Program Counter is made accessible to pro-

grammers by locating it within the Special Purpose area

of the Data Memory. By manipulating this register, direct

jumps to other program locations are easily imple-

mented. Loading a value directly into this PCL register

will cause a jump to the specified Program Memory lo-

cation, however, as the register is only 8-bit wide, only

jumps within the current Program Memory page are per-

mitted. When such operations are used, note that a

dummy cycle will be inserted.

Look-up Table Registers

- TBLP, TBHP, TBLH

These three special function registers are used to con-

trol operation of the look-up table which is stored in the

Program Memory. TBLP and TBHP are the table pointer

and indicates the location where the table data is lo-

cated. Their value must be setup before any table read

commands are executed. Their value can be changed,

for example using the

²INC² or ²DEC² instructions, al-

lowing for easy table data pointing and reading. TBLH is

the location where the high order byte of the table data is

stored after a table read data instruction has been exe-

cuted. Note that the lower order table data byte is trans-

ferred to a user defined location.

Status Register

- STATUS

This 8-bit register contains the zero flag (Z), carry flag

(C), auxiliary carry flag (AC), overflow flag (OV), power

down flag (PDF), and watchdog time-out flag (TO).

These arithmetic/logical operation and system manage-

ment flags are used to record the status and operation of

the microcontroller.

With the exception of the TO and PDF flags, bits in the

status register can be altered by instructions like most

other registers. Any data written into the status register

will not change the TO or PDF flag. In addition, opera-

tions related to the status register may give different re-

sults due to the different instruction operations. The TO

flag can be affected only by a system power-up, a WDT

time-out or by executing the

²CLR WDT² or ²HALT² in-

struction. The PDF flag is affected only by executing the

²HALT² or ²CLR WDT² instruction or during a system

power-up.

The Z, OV, AC and C flags generally reflect the status of

the latest operations.

· C is set if an operation results in a carry during an ad-

dition operation or if a borrow does not take place dur-

ing a subtraction operation; otherwise C is cleared. C

is also affected by a rotate through carry instruction.

· AC is set if an operation results in a carry out of the

low nibbles in addition, or no borrow from the high nib-

ble into the low nibble in subtraction; otherwise AC is

cleared.

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