ST6232BQ3(2003) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST6232BQ3
(Rev.:2003)

8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, 16-BIT AUTO-RELOAD TIMER, EEPROM, SPI AND UART

STMicroelectronics 

ST62T32B ST62E32B

4.3 ARTIMER 16

The ARTIMER16 is a timer module based on a 16

bit downcounter with Reload, Capture and Com-

pare features to manage timing requirements. Two

outputs provide PWM and Overflow (OVF) output

signals each with programmable polarity, and two

inputs CP1 and CP2 control start-up, capture

and/or reload operations on the central counter.

The ARTIMER16 includes four 16-bit registers

CMP,RLCP,MASK and CP for the Reload, Cap-

ture and compare functions, four 8-bit status/con-

trol registers and the associated control logic.The

16-bit registers are accessed from the 8-bit inter-

nal bus. The full 16-bit word is written in two bytes,

the high byte first and then the low byte. The high

byte is stored in an intermediate register and is

written to the target 16-bit register at the same

Figure 27. ARTIMER16 Block Diagram

time as the write to the low byte. This high byte will

remain constant if further writes are made to the

low bytes, until the high byte is changed. Full

Read/Write access is available to all registers ex-

cept where mentioned.

The ARTIMER16 may be placed into the reset

mode by resetting RUNRES to 0 in order to

achieve lower consumption. The contents of

RLCP, CP, MASK and CMP are not affected, nor

is the previous run mode of the timer changed. If

RUNRES is subsequently set to 1, the timer re-

starts in the same RUN mode as previously set if

no changes are made to the timer status registers.

Finally, interrupt capabilities are associated to the

Reload, Capture and Compare features.

8

SCR1

8

SCR2

8

SCR3

4

SCR4

8

16

16

CMP

16

MASK

16

RLCP

16-Bit

16

CP

16-Bit

PSC

fINT

Compare

PWM

16-Bit

Compare-to-0

OVF

16-Bit

COUNTER

CP1

INT

CONTROL LOGIC

CP2

4.3.1 CENTRAL COUNTER

The core of the 16 bit Auto-Reload Timer is a 16-

VR02014

bit synchronous downcounter which accepts the

MCU internal clock through a prescaler with a pro-

grammable ratio (1/1, 1/4, 1/16).

46/84

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