PCD3755EH datasheet(13/32 Pages) PHILIPS

13 / 32 page

1997 Apr 16

Philips Semiconductors

Product speciﬁcation

8-bit microcontrollers with DTMF generator,

8 kbytes OTP and 128 bytes EEPROM

PCD3755A; PCD3755E;

PCD3755F

7.1

EEPROM registers

7.1.1

EEPROM CONTROL REGISTER (EPCR)

The behaviour of the EEPROM and Timer 2 section is defined by the EEPROM Control Register.

Table 10 EEPROM Control Register (address 04H, access type R/W)

Table 11 Description of EPCR bits

Table 12 Mode selection; X = don’t care

76543210

STT2

ET2I

T2F

EWP

MC3

MC2

MC1

BIT

MNEMONIC

DESCRIPTION

STT2

Start T2. If STT2 = 0, then Timer 2 is stopped; T2 value held. If STT2 = 1, then T2

decrements from reload value.

ET2I

Enable T2 interrupt. If ET2I = 0, then T2F event cannot request interrupt. If ET2I = 1,

then T2F event can request interrupt.

T2F

Timer 2 ﬂag. Set when T2 underﬂows (or by program); reset by program.

EWP

Erase or write in progress (EWP). Set by program (EWP starts EEPROM erase and/or

write and Timer 2). Reset at the end of EEPROM erase and/or write.

MC3

Mode control 3 to 1. These three bits in conjunction with bit EWP select the mode as

shown in Table 12.

MC2

MC1

−

This bit is set to a logic 0.

EWP

MC3

MC2

MC1

DESCRIPTION

read byte

increment mode

write page

erase/write page

erase page

not allowed

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