HT85F2270 datasheet(123/226 Pages) HOLTEK

123 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

P0WAKE Register – Port 0 Wake-up

P0WAKE Register

SFR Address: 91h

Bit

Name

P07WU

P06WU

P0�WU

P04WU

P0�WU

P01WU

P00WU

R/W

POR

Bit 7~0

P0WAKE: Port 0 bit 7~bit 0 Wake-up Control

0: Disable

1: Enable

When the device enters the IDLE or Power-Down Mode, the system clock will stop resulting in

power being conserved, a feature that is important for battery and other low-power applications.

Various methods exist to wake-up the microcontroller, one of which is to change the logic condition

on one of the P0.0~P0.7 pins to a low level. Note that the Port 0 wake-up functions are triggered

by a low logic level and not by a falling edge. This Port 0 wake-up function is especially suitable

for applications that can be woken up via external switches. The P0 wake up pins can be selected

individually to have this wake-up feature using the P0WAKE, register.

SRCR Register – Slew Rate Control

SRCR Register

SFR Address: A4h

Bit

Label

—

SRCR.�

SRCR.4

SRCR.�

SRCR.1

SRCR.0

R/W

—

R/W

POR

—

Bit 7~6

Unimplemented, read as “0”

Bit 5

SRCR.5: P5 [7:0] Slew Control Enable

0: Fast

1: Slow

Bit 4

SRCR.4: P4 [7:0] Slew Control Enable

0: Fast

1: Slow

Bit 3

SRCR.3: P3 [7:0] Slew Control Enable

0: Fast

1: Slow

Bit 2

SRCR.2: P2 [7:0] Slew Control Enable

0: Fast

1: Slow

Bit 1

SRCR.1: P1 [7:0] Slew Control Enable

0: Fast

1: Slow

Bit 0

SRCR.0: P0 [7:0] Slew Control Enable

0: Fast

1: Slow

The port pins, when setup as outputs, can be selected to have either a fast or slow slew rate. To

minimise noise generation due to fast switching of the output drivers, it may be advisable to select

the slower slew rate. The slew rates are selected port wide, individual pins cannot be selected to

have either fast or slow slew rates.

HT85F2270 Datasheet(PDF) 123 Page - Holtek Semiconductor Inc

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