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87C196JV Datasheet(PDF) 13 Page - Intel Corporation |
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87C196JV Datasheet(HTML) 13 Page - Intel Corporation |
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13 / 38 page  Automotive — 87C196KR, JV, JT, JR, CA Microcontrollers Datasheet 13 P5.5/BHE#/WRH# Byte High Enable or Write High output, as selected by the CCR. BHE# = 0 selects the bank of memory that is connected to the high byte of the data bus. A0 = 0 selects that bank of memory that is connected to the low byte. Thus accesses to a 16-bit wide memory can be to the low byte only (A0 = 0, BHE# =1), to the high byte only (A0 = 1, BHE# = 0) or both bytes (A0 = 0, BHE# = 0). If the WRH# function is selected, the pin will go low if the bus cycle is writing to an odd memory location. BHE#/WRH# is only valid during 16-bit external memory write cycles. Also an LSIO pin when not BHE#/WRH#. P5.6/READY Ready input to lengthen external memory cycles, for interfacing with slow or dynamic memory, or for bus sharing. If the pin is high, CPU operation continues in a normal manner. If the pin is low prior to the falling edge of CLKOUT, the memory controller goes into a wait state mode until the next positive transition in CLKOUT occurs with READY high. When external memory is not used, READY has no effect. The max number of wait states inserted into the bus cycle is controlled by the CCR/CCR1. Also an LSIO pin when READY is not selected. P5.4/SLPINT Dual functional I/O pin. As a bidirectional port pin (LSIO) or as a system function. The system function is a Slave Port Interrupt Output Pin. P6.2/T1CLK Dual function I/O pin. Primary function is that of a bidirectional I/O pin (LSIO); however it may also be used as a TIMER1 Clock input. The TIMER1 will increment or decrement on both positive and negative edges of this pin. P6.3/T1DIR Dual function I/O pin. Primary function is that of a bidirectional I/O pin (LSIO); however it may also be used as a TIMER1 Direction input. The TIMER1 will increment when this pin is high and decrements when this pin is low. PORT1/EPA0–7 P6.0–6.1/EPA8–9 Dual function I/O port pins. Primary function is that of bidirectional I/O (LSIO). System function is that of High Speed capture and compare. EPA0 and EPA2 have yet another function of T2CLK and T2DIR of the TIMER2 timer/counter. PORT 0/ACH0–7 8-bit high impedance input-only port. These pins can be used as digital inputs and/ or as analog inputs to the on-chip A/D converter. These pins are also used as inputs to EPROM parts to select the Programming Mode. P6.4–6.7/SSIO Dual function I/O ports that have a system function as Synchronous Serial I/O. Two pins are clocks and two pins are data, providing full duplex capability. PORT 2 8-bit multi-functional port. All of its pins are shared with other functions. PORT 3 and 4 8-bit bidirectional I/O ports with open drain outputs. These pins are shared with the multiplexed address/data bus which has strong internal pullups. TXCAN Push-pull output to the CAN bus line. RXCAN High-impedance input-only from the CAN bus line. Table 2. Pin Descriptions (Sheet 2 of 2) Symbol Name and Function |
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