P87C554 datasheet(73/77 Pages) PHILIPS

73 / 77 page

Philips Semiconductors

Product data

P87C554

80C51 8-bit microcontroller – 12 clock operation

16K/512 OTP/RAM, 8 channel 10-bit A/D, I2C, PWM,

capture/compare, high I/O

2002 Mar 25

VDD

RST

XTAL1

XTAL2

VSS

VDD

IDD

(NC)

CLOCK SIGNAL

VDD

P1.6

P1.7

STADC

AVSS

AVref–

SU00219

Figure 59. IDD Test Condition, Idle Mode

All other pins are disconnected2

2. Idle Mode:

a. The following pins must be forced to VDD: Port 0 and EW.

b. The following pins must be forced to VSS: RST, STADC, AVss, AVref–, and EA.

c. Ports 1.6 and 1.7 should be connected to VDD through resistors of sufficiently high value such that the sink current into these pins

cannot exceed the IOL1 spec of these pins. These pins must not have logic 0 written to them prior to this measurement.

d. The following pins must be disconnected: XTAL2 and all pins not specified above.

VDD–0.5

0.5V

0.7VDD

0.2VDD–0.1

tCHCL

tCLCL

tCLCH

tCLCX

tCHCX

SU00220

Figure 60. Clock Signal Waveform for IDD Tests in Active and Idle Modes

tCLCH = tCHCL = 5ns

VDD

RST

XTAL1

XTAL2

VSS

VDD

IDD

(NC)

VDD

P1.6

P1.7

STADC

AVSS

AVref–

SU00221

Figure 61. IDD Test Condition, Power Down Mode

All other pins are disconnected. VDD = 2 V to 5.5 V3

3. Power Down Mode:

a. The following pins must be forced to VDD: Port 0 and EW.

b. The following pins must be forced to VSS: RST, STADC, XTAL1, AVss, AVref–, and EA.

c. Ports 1.6 and 1.7 should be connected to VDD through resistors of sufficiently high value such that the sink current into these pins

cannot exceed the IOL1 spec of these pins. These pins must not have logic 0 written to them prior to this measurement.

d. The following pins must be disconnected: XTAL2 and all pins not specified above.

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