EM73P362CQ datasheet(23/44 Pages) EMC

23 / 44 page

This specification are subject to be changed without notice.

11.1.2001

EM73P362

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

8-BIT BINARY COUNTER

Write the preset value to the registers

The value of 8-bit binary counter can be presetted by P3 and P5. The value of registers can be loaded into

the 8-bit binary counter when the counter starts counting or occurs overflow. If you write values to the

registers before the next overflow occurs, the preset value can be changed.

Read the count value from the registers

The count value of 8-bit binary counter can be read out from P3 and P5. The value is unstable when you

read out the value during counting. Thus, you must disable the counter before reading out the value.

12-BIT GENERAL COUNTER (TCB)

Write the initial value to the registers

The initial value can be written into the 12-bit counter registers by using STATBL, STATBM and STATBH

instructions. The value of registers can be loaded into the 12-bit binary counter (TCB) and the TCB in

creases one when the 8-bit binary counter overflows.

Read the count value from the registers

The count value of 12-bit binary counter can be read out from the counter registers by using LDATBL,

LDATBM and LDATBH instructions.

20-BIT COUNTER FUNCTION

The 8-bit binary counter is connected to TCB which is one 12-bit general counter and becomes to the 20-

bit counter. The TCB increases one when the 8-bit binary counter overflows and generats an overflow

interrupt (TRGB) when the TCB overflows. In this case, the TCB cannot be used as a 12-bit counter

alone.

FUNCTION OF HIGH SPEED COUNTER

The HTC has three modes which are RFO mode, melody mode and auto load timer mode. In these

mode, the HTC loads the initial values from the counter registers (P3, P5) when it is enabled by P17 and

it also can be auto-reloaded the initial values when it overflows. The HTC is counted by the internal pulse

and the value of TCB increases one when 8-bit binary counter overflows. The TCB can generate an

overflow interrupt (TRGB) when it overflows. The TRGB cannot be generated when the HTC is in the

melody mode or disabled.

The HTC is disabled when the CPU is reseted or in the STOP/IDLE operation mode. Users must enable

it by self when the CPU is waked up.

EM73P362CQ Datasheet(PDF) 23 Page - ELAN Microelectronics Corp