HT46R47 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

HT46R47

8-Bit OTP Battery Charger Controller

Unspecified 

clock setting register (ACSR;23H), I/O regis-

ters (PA;12H, PB;14H, PD;18H) and I/O con-

trol registers (PAC;13H, PBC;15H, PDC;19H).

The remaining space before the 40H is re-

served for future expanded usage and reading

these locations will get "00H". The general

purpose data memory, addressed from 40H to

7FH, is used for data and control information

under instruction commands.

00H

In d ir e c t A d d r e s s in g R e g is te r

01H

MP

02H

03H

04H

05H

ACC

06H

PCL

07H

TB LP

08H

TB LH

09H

0A H

STATU S

0B H

IN T C

0C H

S p e c ia l P u r p o s e

D ATA M EM O R Y

0D H

TM R

0E H

TM R C

0FH

10H

11H

12H

PA

13H

PAC

14H

PB

15H

PBC

16H

17H

18H

PD

19H

PDC

:U nused

1A H

PW M

1B H

R e a d a s "0 0 "

1C H

1D H

1E H

1FH

20H

ADRL

21H

ADRH

22H

ADCR

23H

ACSR

24H

3FH

40H

G e n e ra l P u rp o s e

D ATA M EM O R Y

(6 4 B y te s )

7FH

RAM mapping

HT46R47

All of the data memory areas can handle arith-

metic, logic, increment, decrement and rotate

operations directly. Except for some dedicated

bits, each bit in the data memory can be set and

reset by "SET [m].i" and "CLR [m].i". They are

also indirectly accessible through memory

pointer register (MP;01H).

Indirect addressing register

Location 00H is an indirect addressing register

that is not physically implemented. Any

read/write operation of [00H] accesses data mem-

ory pointed to by MP (01H). Reading location 00H

itself indirectly will return the result 00H. Writ-

ing indirectly results in no operation.

The memory pointer register MP (01H) is a 7-bit

register. The bit 7 of MP is undefined and reading

will return the result ²1². Any writing operation to

MP will only transfer the lower 7-bit data to MP.

Accumulator

The accumulator is closely related to ALU oper-

ations. It is also mapped to location 05H of the

data memory and can carry out immediate data

operations. The data movement between two

data memory locations must pass through the

accumulator.

Arithmetic and logic unit - ALU

This circuit performs 8-bit arithmetic and logic

operations. The ALU provides the following func-

tions:

· Arithmetic operations (ADD, ADC, SUB,

SBC, DAA)

· Logic operations (AND, OR, XOR, CPL)

· Rotation (RL, RR, RLC, RRC)

· Increment and Decrement (INC, DEC)

· Branch decision (SZ, SNZ, SIZ, SDZ ....)

The ALU not only saves the results of a data op-

eration but also changes the status register.

Status register - STATUS

This 8-bit register (0AH) contains the zero flag

(Z), carry flag (C), auxiliary carry flag (AC),

overflow flag (OV), power down flag (PD), and

watchdog time-out flag (TO). It also records the

Rev. 1.40

9

July 18, 2001

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