PCD3745AP datasheet(17/32 Pages) PHILIPS

17 / 32 page

1999 Feb 02

Philips Semiconductors

Product speciﬁcation

8-bit microcontroller with 4.5 kbytes OTP

memory and 32 kHz real-time clock

PCD3745A

REDUCED POWER MODES

9.1

Idle mode

In Idle mode, the Real-time clock, Counter 1 and

Counter 2 sections remain operative. In addition to the

description given in the

“PCD33xxA family data sheet”,

Idle mode may be left by a clock or a counter interrupt

event (see Section 8).

9.2

Stop mode

In Stop mode the Real-Time Clock, Counter 1, Counter 2

and the 32 kHz crystal oscillator sections remain operative

(depending on the state of the RUN and ECx bits in CLCR

and PCCR). In addition to the description given in the

“PCD33xxA family data sheet”, Stop mode may be left by

a clock or a counter interrupt event (see Section 8).

10 INSTRUCTION SET RESTRICTIONS

RAM space is restricted to 224 bytes; care should be taken

to avoid accesses to non-existing RAM locations.

11 TIMING

The PCD3745A operates over a clock frequency range of

1 to 16 MHz.

12 RESET

In addition to the conditions given in the

“PCD33xxA family

data sheet”, all derivative registers are cleared in the reset

state.

13 SUMMARY OF CONFIGURATIONS

Table 10 Port conﬁguration (see notes 1 and 2)

Notes

1. 1 = standard I/O; 3 = push-pull Output.

2. Port state after reset: S = Set (HIGH) and R = Reset (LOW).

Table 11 Product conﬁgurations

TYPE

PORT 0

PORT 1

0123456701234567

PCD3745A

FEATURE

DESCRIPTION

Program/data code

any mix of instructions and data up to OTP memory size of 4.5 kbytes

Oscillator transconductance

ﬁxed at LOW transconductance (gmL); the maximum crystal clock frequency is 6 MHz

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